You just noted that Syria was so chaotic (a very mild term for the place), that this chaos, and the threat it posed to American citizens, was the reason behind Obama's temporary immigration restriction actions.   The 6 other nations on Obama's list are also chaotic hotbeds of people who have stated they hate the West and want to kill Westerners for the sake of their religion.

So I don't understand how Obama's temporary ban is justified, while Trump's temporary can be said to be born out nothing but bigotry and pure hatred.  

Both presidents operate in an era where Muslim terrorism is a fact.   Both recognize 7 nations where this terrorism is prevalent.   Neither of us likely has info for an informed opinion whether those visas assured proper vetting.   There are some matters that we have to trust to elected officials and intelligence agencies.

A president's #1 job is protecting American citizens, and given ISIS it's very difficult.  They are due their power to make bans.