Why We Should Not Accept the Syrian Islamic Refugee Poison Pill?

I saw this important tweet from Susan @sdv92 this afternoon. It captures the essence of the problem in accepting any Muslim Iraqi or Syrian refugees without proper and complete vetting. I don't trust the current administration in doing any effective vetting.

Isn't it bad enough that our borders are essentially unsecured, expired visas are ignored, and our immigration laws are not being enforced?