Marquis de Sade was arguably
  the most dangerous man alive;   until
the Reign of Terror & Napoleon;  who
was arguably the most dangerous man
alive; until Jack the Ripper,    who was
the most dangerous man alive;      until
WWI & ******; who was the most dangerous
man alive; Al Capone was the most
dangerous man alive,   until Hoover,
who was the most dangerous man
alive;      Malcolm X was the most dangerous
man alive,  until the AK47 & AR-15; now we
can all be the most dangerous person alive;
      but human beings have always been the
  most dangerous species on earth;
the nuclear bomb was the most dangerous
thing on earth until climate change;    now
the earth itself is the most dangerous thing
on earth