Just a general comment for everyone, to be ignored, I'm sure, by most:
Some people are very passionate about certain topics. It might be gay marriage, or abortion, or feminism, or children - or something totally combustible like homeschooling. Whenever that particular topic is discussed in the Bloggernacle, these people come out of the woodwork and comment on blogs they don't give a large rodent's hairy hindquarters about on a daily basis. They don't participate regularly, so they don't know everyone who does - so their diatribes are based solely on assumptions about regulars.
My unrequested advice:
Understand that these people are topic-shoppers, so don't take their comments personally. They believe what they believe, and they don't comment on any other threads. Let them launch their broadsides; let them not even try to understand you; let them live in their own world - and don't begrudge them their passion, whether or not you agree.
They probably aren't trolls in real life - only when it comes to their particular passion. They don't participate to become part of a community; they swing their swords in defense of truth and right - and they do so from both sides of each issue. Understand their topical trollishness, and just endure to the end. This too shall pass.
End of sermon - Stepping down from the pulpit.