I do not owe their beliefs respect. There is, however, a naive part of me that thinks they might change some day, and I wonder if maybe I could play some part in that. I'm probably wrong on this, though.
I also pity people like that.
However, my ideals regarding this are sort of libertarian. I also don't always live up to my ideals in this regard. I think if you silence them, you make it look like they have a point. Arguing with them is fine, though.