So as evidence supporting the rationality of Drumpf's ban you cite the single example of one lone wolf from Somalia – who was already in the USA on a student visa presumably so wouldn't even be covered under the new ban – as warranting a ban on travellers from seven (and now six) nations.

In my original post I listed several causes of preventable death in the US that account for hundreds of thousands of deaths every year which, I think, goes a long way towards highlighting the irrationality (and uselessness) of Drumpf's ban.

I somehow think your one example does anything to diminish my point.