Because it could ONLY be Iran which doesn't want USA to have nuclear weapons...

Historically speaking, USA is more likely to drop an atomic bomb than Iran (or any other country for that matter)

No. Several countries & it's not entirely straightforward telling which.

No but the original article states a fear that the facility could be used to create a stockpile that could then be enriched to weapons-grade should Iran chose to do so. I'm not saying whether that is right or wrong but The article in the NYT states the President's fears.