I'd love to see your cites and stats re "police standoffs gone wrong" in 2016.
According to the Washington Post, 963 people were killed last year in the U.S by police. I filtered that down to people that had guns, in order to kinda hit your 'standoff' thing, and got 518 people. I assume that if someone has been killed, then it's a standoff 'gone wrong', but I suppose there's no clear definition of what it means for a standoff to 'go wrong'. You might argue that if the bad guy got killed, maybe the standoff went right, so let's instead use the number of police killed in action. That's 46 officers for the year 2016, according to the BBC.
Now, how many people were killed by islamic terrorists in 2016 that arrived here by plane from one of the 'banned' countries?
It's none, isn't it? There were terrorist attacks for sure, but Omar Mateen was 'self-radicalised' and was from New York, Dahir Ahmed Adan was from Somali (the country is on the list), but he didn't kill anyone, Ahmad Khan Rahami was from Afganistan (not on the list) and didn't kill anyone, and Abdul Razak Ali Artan (also from Somali) also didn't kill anyone. Names from here.
So, you are more likely to be a police officer killed in the line of duty, than by a terrorist that's arrived from one of the banned countries.
Furthermore, as you no doubt very well know, Trump himself has publicly stated on more than one occasion that the ban is about religion. This is why it has been struck down in the courts, because there is no other basis for his choices. There's certainly no public safety basis, that's for sure.