I am well aware of 1st Amendment Rights and my view is very much like yours.
I also believe that MacArthur has the right to open his Church.
What I have a problem with is Christians who throw other Christians under the bus and claim that they are not true Christians for having a different understanding. I am finding this happening more and more and it is not like it is Arminians against Calvinists. It is Calvinists against Calvinist. Exactly what the enemy wants.