That's a flaw in democracy, not my argument. Democracy relies on the majority having good moral judgment. If you're in the minority, too bad. I'm sure there are lots of religious people that would like to impose their morals on the majority, and I think you and I both agree that's not a good idea. But now that your group might be minority (by a slight margin), suddenly it's okay to do anything it takes to impose your morals on the majority?
That's not a moral argument, just an appeal to popularity. The same could be said in 1932 Germany and it would be just as wrong then. To be clear I'm not suggesting Trump is Hitler, but your argument is flawed.