And if the government can do that, what keeps the government from treating other freedoms the same way?
And that’s the real danger here.
There's no "Freedom" issue involved here.
If we were talking about these people refusing to bake a cake because the couple was black or interracial or Jewish, no one would be talking about "Freedom" here. They would say, "There's a public accommodation law, you are in violation of it."
The Kleins have a redress. They can find something else to do for a living if their religious convictions will not let them serve gays. (Which, by the way, they pretty much have.)
Public accommodations laws violate the fundamental freedom of association. This is the moral equivalent of forcing children to be "friends" with the nerd. It might be the right thing to do, as a parent. But government isn't a parent, Joe.