To be fair I don't think (most of) the left are  particularly enamoured with most of the countries  you talk about  either.    The difference is that US holds itself up as a bastion of  freedom and possibly even equality.   And what's more they allow people  to  by and large freely protest, which is something that the countries  who ban Jews don't  tend to allow either.   Hence there is limited  outlets for affecting any sort of protest let alone change in the  countries of concern.
And whilst there are some on the left that are indeed intolerant and  hateful the majority with left leanings (but perhaps not hardcore)  probably just want a fair go for all and want some form of truth ... it  seems that media and the trumpocracy are both difficult to believe and  the truth is somewhere in the middle. 
Personally, the thing that would appear most concerning about the whole  issue is it's rushed implementation ... one of the biggest concerns  about Trump, from both sides, is his preparedness and willingness to  shoot from the hip, so to speak.  This does nothing to dispel those  concerns.