Contrary to popular belief not all Syrian refugees are terrorists. There might be one in the bunch but that could also just be paranoia brought on by right wing propaganda. Unless they pose a threat to the safety and integrity of the state then there should be no reason to bar them from the state.
No, I do not think that Texas should have tried to bar Syrian refugees from living in the state because America is a nation of immigrants and our country was established as an accepting nation of all people. I believe it is wrong to ban people that are fleeing war and seeking a better lives for their families.
Refugees go through some of America's strictest vetting. With decent control, weeding out the religious ISIS nutcases should be easy. And, if they are so concerned of the Trojan Horse theory, what about those coming on a tourist visa? The leader of the Paris plot was from Belgium, not a refugee. For anyone visiting the US, how easy was it to get your tourist visa? This is all based in pure jingoism. People asking Could dangerous refugees come to the US and carry out a Paris-style attack? should answer first Could people come to the US legally and carry out a Paris-style attack, too?. The answer is yes, so should we stop people from legally entering the US? That's exactly terrorists are aiming, create chaos, and mistrust among people.
Texas should not have tried to bar Syrian refugees from living in the state. The refugees are vetted closely, making it hard for terrorists to get in to the country. There is a lot of anti-Muslim propaganda going on right now, and this adds to it. It is not helpful.