The NATO intervention in Yugoslavia was hardly to prevent a genocide unless you believe the US suddenly started caring about Muslim life - and then went on to maraud across the middle east leaving a trail of bodies in its wake.
There’s documented accounts of displaced Romani having to pretend to be Kosavar Albanians because there was zero humanitarian aid available for people not of the chosen ethnic group of the day.
One of the most interesting facets of the NATO air campaign is how they managed to demolish all the state owned factories and infrastructure, but leave the ones owned by westerners.
There’s also another issue with what NATO did to Serbia - Kosovo voted to unilaterally secede. I can think of at least one other prominent example where another territory did just that and it is seen as totally illegitimate by basically everyone in the west. Which is it?
The Taliban harbored al-Qaeda which used Afghanistan as its base of operations when it coordinate the 9/11 and 7/7 terrorist attacks. So yes.
The US was their first backers, getting 9/11’d was just blowback for shitty decisions made decades ago, and murdering a bunch of Afghanis and Iraqis was hardly defensive. We totally had troops guarding poppy fields and oil derricks for like 2 decades after as a part of that “defensive” operation.