I am on the fence about this one as well.
Let them in: they are human beings and their home country sucks 20 ball sacks (In a bad way).
Don't: Why give benefits to these people when we can't benefit our own? Also, why have them come across the planet to a country with such a different culture, when their neighboring countries are much more like home to them.
And (Just addressing one point here) the reason why ISIS (and other terrorist organizations) are worse than tobacco, fat/salt etc is that their main purpose is to kill people who live a different lifestyle. Fatty foods and tobacco is a personal decision which will kill you sooner in the long run (although it does cost the tax payer a ton). Firearms don't have the main/sole purpose of killing others. But, gun violence does bother me, and it bothers our entire society, so I think adding something else to the mix (ie a possible terrorist infiltration) would not be fine just because "well, not that many more people would be killed if we let ISIS in."
And actually, another point: The war was not "for oil." Was it longer/more in depth than it needed to be? Absolutely. But what is the difference in "help[ing] the people who have lost everything" versus the US going to war to track down people who caused people in the US to have lost everything (9/11). I just feel like people scream "America needs to be more isolationist" but then this roles around and people say "OMG, why isn't America getting more involved in people's problems!?!?"
You can benefit your own people, you just choose not to.
If you don't believe the wars in Iraq, Afghanistan, Libya and Syria are for natural resources, you're either ignorant or directly benefiting from global imperialism.
Also pretty sure that the purpose of a firearm is to kill. You can't exactly eat soup with it or change the channel on your TV with it.
The fact that people are willing to condemn hundreds of thousands of people who need just because they ignorant or asylum procedures it's pretty pathetic.