Why are we allowed to ban champions that are already picked by our team-mates?

Ever since I started playing this game two years ago, I have played on EUW, EUNE and NA and I haven't found a single good thing about banning your team-mates' picked champions, It's only there to troll and anger people, there is no point of allowing players to ban champions that are already picked by your own team mates Why is this allowed and why does Riot think that this is a good idea?
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