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.