Paris: At least 128 dead in 6 terrorist attacks

As an American I'm really facing a crossroads, it really boils down to assuming the best or the worst in people. We genuinely already have an immigration problem, not so much of people looking to start the american life, but criminals. By criminals I mean actual crimes, drug dealers mainly, that kind of thing. The fact is Sryrian is in dire straights and I feel isis' main objective is to isolate muslims from the western world so they have a bigger army, since they(Muslims who are isolated) will turn to them(Isis), at the same time you do have the risk of radicals slipping through, so as an American should we risk our lives for those in need? It's hard for me as someone with a job with verifying information, to accept individuals blindly who have no records, and fake passports plentiful. It's impossible for me to say I'm okay with this even if there is a family next to them who genuinely needs this type of asylum. I feel as an American we should take the risk for individuals who are in turmoil. At the same time, is America at a point (even with the low percentage compared to other countries)where we have the ability to bring these families stability, or are just harboring a ticking time bomb of frustration?

Should we assume the worst for our security, or the best for our humanity, I feel a lot of individuals are having a tough time seeing past that line, specifically Americans, Europe is much, much worse off with this.