Did something particular spark this thought? Or just general feelings?
Well, I get irritated when people pull threads off target before the OP doesn't get a good answer or just get stupid in the same old ways and so, when either of those happens I unsubscribe.
I am not able to kill all the people who deserve it (it turns out that murder is illegal and some of them live a long way away also) and so I just block them so I don't have to read them ever. It's the height of passive-aggressiveness. My hope is that, eventually, one of them will be dying from an poison to which only I have the antidote and because they've been a boob, I have blocked them and thus won't hear their pleas for help.
I do hope that someone does tell me about this when it happends so my blocking won't have been in vain.