What The US Army did against the insurgents in iraq when they occupied many of its cities?

What The US Army did against the insurgents in iraq when they occupied many of its cities?

It was the same to what Syrian army did against the insurgents who occupied many of syrian cities:

Indiscriminate bombing of buildings by tanks and planes
Mass arrests of innocent people
Mass murders of civilians
Rape
Torture
and so on

Both of them did crimes against humanity

But only the syrian regime must fall because of its crimes and US regime On the other hand must continue to role the world and punish other regimes.