The systematic idiocy
the war
Approximate number of wars fought from historic time up to 2,000
[Most data were taken from: G. C. Kohn 'Dictionary of wars', Facts on file Ed., NY]
Continent   from Year   # of years   # W a r s # war years  # wars/year   W-y /year
EUROPE  ~1,200 BC       3,200       1,671      11,670       ~0.5     ~ 3.7
ASIA  ~1,700 BC       3,700          840         5,350       ~0.23     ~ 1.4
AMERICA  ~1,500          500          238           802       ~0.5     ~1.6
North AM.  ~1,500          500            83           282       ~0.17     ~0.6
Centr. AM.  ~1,500          500            67           204       ~0.13     ~0.4
South AM.  ~1500          500             88           316       ~0.18     ~0.6
AFRICA  ~1,500 BC       3,500          248        1,130       ~0.07     ~0.3
AUSTR.+NZ  ~1,800          200            13             60       ~0.07     ~0.3

     TOTAL:  ~ 3,010 WARS

                                         for a TOTAL of ~ 19,012  YEARS at WAR  / 3,700 years


            DEMOCIDES
According to definitions of Rudolph Rummel:
" Genocide: among other things, the killing of people by a government
because of their indelible group membership (race, ethnicity, religion, language).
Politicide: the murder of any person or people by a government because
of their politics or for political purposes.
  Mass Murder: the indiscriminate killing of any person or people by a government.
    Democide: The murder of any person or people by a government,
including genocide, politicide, and mass murder."
[ Rudolph J. Rummel ]
 

Pre-Twenthieth Century

 Country / Regime          Years           Total killed
        China      221 bc  <> 19° C          33,519,000
        Mongols       14° C <> 15° C          29,927,000 
   Slavery of Africans        1451 <> 1870          17,267,000
Mexico+South America       16° C <> 19° C           13,778,000
   Thirty Years War        1618 <> 1648            5,750,000 
       India        13° C <> 19° C            4,511,000
       Iran         5° C <> 19° C            2,000,000
  Ottoman Empire        12° C <> 19° C            2,000,000
      Japan        1570 <> 19° C            1,500,000
      Russia        10° C <> 19° C            1,007,000
  Christian Crusades         1095 <> 1272            1,000,000 
     Aztecs          [centuries]        [   1,000,000   ]
  Spanish Inquisition        16° C <> 18° C               350,000
  French Revolution        1793  -   1794               263,000
  Albigean Crusade        1208 <>1249               200,000
  Witch Hunts        15° C <> 18° C               100,000
 TOTAL for all Cases            pre-20° C        133,147,000
 Hypothetical Total       30 bc <> 19° C        625,716,000
 War Related Deaths       30 bc <> 19° C          40,457,000
                       From Rudolph J. Rummel [modified]
                             C = century
 

                                                Twentieth Century
                       Democides

      C O U N T R Y            Y E A R S    TOTAL  KILLED
     Soviet Union          1917 <> 1987            61,911,000
   Communist  China          1949 <> 1987            35,236,000
     Nazi  Germany          1933 <> 1945            20,946,000
   Nationalist China          1928 <> 1949            10,075,000
         Japan          1936 <> 1945              5,964,000
      China CG          1923 <> 1949               3,466,000 
      Cambodia          1975 <> 1979              2,035,000
      Turkey          1909 <> 1918              1,833,000
      Vietnam           1945 <> 1987              1,678,000
      North Korea          1948 <> 1987              1,663,000
      Poland          1945 <> 1948              1,585,000
      Pakistan          1958 <> 1987              1,503,000
      Mexico           1900 <> 1920              1,417,000
      Yugoslavia [Tito]          1944 <> 1987              1,072,000
      Russia           1900 <> 1917              1,066,000
      China [warlords]          1917 <> 1949                 910,000
      Turkey [Ataturk]          1919 <> 1923                 878,000
      United Kingdom          1900 <> 1987                 816,000
      Portugal          1926 <> 1982                 741,000
      Indonesia          1965 <> 1987                 729,000
      Others          1900 <> 1987              2,792,000
     WORLD  TOTAL          1900 <> 1987          169,202,000
                            From Rudolph J. Rummel [modified]
 
 

The 20° century Bloodiest Murderers

          Ruler     Country      Years  Total Killed
    Joseph Stalin     Soviet Union     1929 <> 1953      42,672,000
   Mao Tse-tung        China     1923 <> 1976      37,828,000
    Adolph Hitler     Germany     1933 <> 1945       20,946,000
Chiank Kai-Sheck        China     1921 <> 1948      10,214,000
  Vladimir Lenin     Soviet Union     1917 <> 1924        4,017,000
    Tojo Hideki       Japan     1941 <> 1945        3,990,000
     Pol Pot      Cambodia     1968 <> 1987        2,397,000
     Yahya Khan      Pakistan          1971        1,500,000
      Josip Tito     Yugoslavia     1941 <> 1987         1,172,000
  Communists       World   1917 <> 1987     88,086,000
      Others       World   1921 <> 1987     36,650,000
                       From Rudolph J. Rummel [modified]

Statistics about two of the most infamous crimes:

    1 - The number of Person - in the World - convicted in the criminal courts for committing
Homicide
are expected to be about 300,000 / year [reference year 1999],
being  the average total rate of intentional homicide + non-intentional homicide [1999]:
~ 4.85 homicides / 100,000 inhabitants / year
[THEUNITED NATIONS Office on Drugs and Crime, Center for International Crime prevention].

    2 -  The number of Person - in the World - convicted in the criminal courts for committing
Rape
are expected to be about 156,000 / year [reference year 1999],
being the average rate ~ 2.6 Rapes / 100,000 inhabitants / year
[UNITED NATIONS Office on Drugs and Crime, Center for International Crime prevention].