from wikipedia:
Quote:
Common definitions of terrorism refer only to those violent acts which are intended to create fear (terror), are perpetrated for a religious, political or ideological goal, deliberately target or disregard the safety of non-combatants (civilians), and are committed by non-government agencies.
everything except the last point fits.

regarding hiroshima and nagasaki... i don't quite get why it was necessary to wipe out two cities instead of demonstrating the bomb on some empty area.