Of course it's liberals. If it's something that's on their agenda (gay marriage, for instance), then they DEMAND inclusion ("marriage for everybody!"). But if it's something that's not on their agenda, then if there's a chance that one person or group may be offended or feel left out, then their position is "No, we can't allow that, it needs to be stopped".
That's why Nativity scenes are now controversial and often banned in public places at Christmastime. And now it's extended to Halloween.
Don't pretend that you don't realize that's EXACTLY what's happening.