Bush wanted Sadaam Hussein dead because Sadaam threatened to kill Bush's father. The only way was to invade Iraq on lies manufactured by a compliant CIA.
Sadaam may be a despotic dictator, but he posed no threat to the US or the rest of the world, outside the middle east.
The rise of al-Qaeda and ISIS can be traced to the US invasion of Iraq.
USA should have left Sadaam to counter the Wahabis of Saudi Arabia - the exporters of fundamentalism.