People get angry at me for banning a champion they didn't pick

This is happening quite a lot lately... We can pick a champion in champ select before we ban someone. Sometimes a person doesn't choose a champion. So I ban a champ my teammates didn't lock in. Then I get flamed: why did you ban *champion name* you *curse words* *flame* I ask them how can I smell that they want to pick that champion? Then they don't respond. I'm baffled..
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