One is a matter of internal policy, the other is a matter of international law and order. One the USA had complete and total control over for decades, the other is a delicate and precarious matter which requires significant planning, oversight, congressional approval, and international engagement.
> Why? Those are two completely different things.
These are different things, yes, but the problem is exactly that: the same methods and justification will be applied in either case, despite deserving totally different treatment. I believe this is the consequence of permitting brazen realpolitik principles into government.