Americans have not only failed to catch the main culprits.

I wouldn't say failed as that would imply they tried, which I doubt.
On the other hand, you're right - it is unreal to see the Americans so comfortable in bed with those people, while they're busy picking fight with everybody else. Trump is about to come to Europe at the end of the week and we can expect a lot of angry comments directed at their European allies, like he did last time.
And, no, don't worry, I'm not bothered in the least with what they're doing over there, just that I read so much crap I thought it was worth writing a post.