If Americans are judged by our citizens that committed violent crime, should we all be more closely vetted with traveling worldwide?

I'm fine with enhanced vetting, nothing wrong with caution although it seems the Obama folks did a great job with these seven mentioned countries.    

My concern is the extra resources devoted to these seven country give cover to those who are more likely to attack us from other nations.   How in heavens name are we not stopping those from Saudi Arabia for instance?   It seems a very arbitrary ban, that will give us an illusion of safety, not real security.    I think it's political BS, not serious policy.  

It's also a short term ban, not necessarily permanent.   Correct me if I'm wrong about that.