Between what you think you know, and what the reported facts are, I'm going to go with the facts.
I'm not saying we should let them into the US (we shouldn't) or that they're a very strong force in region, but we should at least try to find out what's actually going on over there, rather than just rely on what we think we already know.
The Obama administration claimed the Muslims that they funded and armed had been vetted and were “secular moderates”.
After the received US money and arms they suddenly reverted to being radical jihadists.
There are example after example of Obama claiming that the people he gave money to were our allies. After they received money and arms they predictably turned on us.
The Obama administration created ISIS and their allies. They pulled out of Iraq. They funded terrorists. They refused to use US air power to bomb and destroy ISIS strongholds.
It is not that complicated.