what's wrong with people who troll in bot games?

drag it on super long, do weird things, not hit turrets but walk away, intentional die , feed the bots, dance around the map, sit in jungle and walk occasionally, while they are not new players they are like level 120. What's wrong with people like this? just want to fast lvl up my account but every 3-4 games i get a troll who just screws the game and sometimes make it 30+ min while we can finish in 7 min then laughs and say 'your welcome'.
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