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In a perfect world, LL would be a 100% free community, and everything would work. But let's say I open up, say, a weekly political thread. People take politics seriously, and they take political disagreement seriously, and it is entirely possible, if not probable, that people would form strong opinions of other posters in that thread and respond to them accordingly in others.
I don't want groups of Mariner fans to start hating each other just because they voted for a different governor, you know?