Here’s my response: Because its none of my (or your) fucking business to tell them they’re NOT allowed to. They’re just as American as you or I am. Its 100% wrong to deny them the same freedoms and liberties as you or I enjoy just because they’re different from us.
The only reason you’ve been able to give is because you believe that marriage should be between a man and a woman. That’s YOUR personal view. Thats great. Live your life by your beliefs. You cross the line when you want to impose your personal views on others.