Again, I can't stress this enough - the fact that he's threatening to do a genocide, and strongly implying he's going to nuke Iran, is in it and of itself the problem.
The standard cannot be "the President nuked somebody" because it's too fucking late once the President has nuked someone. You are being encouraged to adopt an illogical position by bootlicker VERY SERIOUS PEOPLETM. It does not compute that you should wait for Trump to actually nuke s/o before emergency measures are considered.