Why aram is "This is ARAM"

I dont play ranked or normal game, for like 2 years im pure aram player because i find it way more fun. and its realy make me mad when toxic, troll and afk that is way more common in aram go without any punishment and anyone else say "why report this is only aram". so if i go on toxic spread to intentionaly ruin ewryone game it will go without any punishment for sure. Why is that common?
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