Opponents of the Trump ban say it will make the threat greater?
And, how will it make it worse? Will a ban on entry to the US change someone from being a peaceful Muslim into someone who wants to commit mass murder for Allah attacks? That argument does not make a lot of sense to me. It suggests that Muslims are irrational people whose fuse can be lit by any type of rejection. If that were really the case, wouldn't it be better to catch them at the border before they put innocent people at risk?