Why not? I don't care if my neighbor believes aliens built the pyramids and some deity created all animals in their present form in six days. I do care if they pressure the school board to teach those things to my children.

In the same way, I don't care if somebody believes that different races shouldn't intermarry because of dilution of racial purity or that people of the same sex shouldn't marry because of Adam and Steve. I do care if they try to put that into law.

This is the same logic that was used to justify policies like Don't Ask, Don't Tell.

We are not perfect beings; we make mistakes, we believe things that end up being false, and we do things that we (or the rest of society) will regret later. As such, advocating that opinions other than the current prevailing set should be suppressed is a dangerous game to play. I know that like most of the people advocating it are doing so out of a desire to see the world become a better place. But since we've been wrong before about what "a better place" looks like, we should exercise utmost caution in telling others to be silent about their own views.

Really? You think there's a chance we're wrong about the pyramids and allowing racial mixing?

Clearly, we aren't. Clearly, the people who push the opposing policies are harming society. Just like with evolution, there is no debate among thinking people about this.