A lot of people have been bringing up that "the countries on Trump's ban aren't the ones that have people who killed Americans in terrorist acts in the US." Which is valid.
But I'd go even further: America doesn't have a terrorism problem. There's around an average of [10 deaths](https://www.start.umd.edu/pubs/START_AmericanTerrorismDeaths_FactSheet_Oct2015.
pdf) from terrorism in the US per year. How low could we possibly get that in a country with more guns than people?
Even assuming a diffuse probability in Muslims having a certain chance to commit these acts (which again, is not the case), that is a 10/[3.3 million](https://en.wikipedia.org/wiki/Islam_in_the_United_States)=0.
0003% chance that any given Muslim will kill someone through terrorism.
And if you stopped all Muslim immigration (which this ban is not even doing), that would decrease your chance of death from terrorism by 0.0003%*[50,000](http://www.pewforum.org/2013/05/17/the-religious-affiliation-of-us-immigrants/)=15%.
So around 1 more death from terrorism a year.
And this is ignoring the possible increase in terrorism from growing animosity, problems with relations between countries, the deaths of refugees that we don’t help, etc.
EDIT: Not exactly the change I thought might happen, but it turns out that the ban might actually increase the risk of terrorism due to alienation. I said "Trump's ban will have no impact on it".
It very well could have an impact. Just probably not the direction we'd like.
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