Wow, I just had my first Facebook Moment. On Facebook, people block you just for the crime of disagreeing with them... Whaddya know... that happened to me just the moment. I got blocked just for disagreeing with someone.
This is why I don't block people. The day I become that overly-sensitive, then I'm no longer qualified to be on a site like this.
I will block if someone threatens me, or if I feel they're stalking me or being inappropriate, but most people are just obnoxious, not necessarily dangerous. Don't get me wrong, I'm as obnoxious as the next person... another reason I don't block others.
But I would hope that on a site based on logic and reason, we could disagree, without feeling the need to block the person we disagree with.