It's hard but possible, I find, to post and discuss controversial things. You have to be very carefull how you present the topic, and you have to put a lot more effort into the discussion than you normally might to make sure it doesn't devolve, but if you wade through and cut off the drive-by commenters that misunderstand your position because they aren't actually bothering to think critically about it,and try to try to keep the discussion it on track, you sometimes get very interesting discussions out of it.

Sometimes I end up softening or changing someone's position on something, sometimes I soften or change mine or learn a lot of new things, and I have to imagine that happens with some lurkers as well, and I'm not sure what more I could hope for, besides wishing it was easier sometimes.