"The Obama-Hillary administration were waging war, invading, occupying, and droning those seven Islamic nations. Since when does a nation invite the enemy into its country?"
You see, here is the major difference in opinion between those for and against the ban - "enemy".
There is no evidence to support the fear/fantasy that the US is letting the "enemy" into the country, under current circumstances.  In the absence of this evidence one can only conclude Trumpism is using this "reason" as an excuse to advance a bigoted ideology, or Trumpism governs in an abject vacuum of reality.
And, yes, the US has never dealt well with the ME.  President's, in recent times, have done little other than create their own enemies in the ME.