Did Riot ever consider not to allow creating of second account??

Reason why is simple .The fact that there is possibility to create new account contributes toxicity in LoL .If things aren't going well on one account you can feed ,troll and flame because you have second,third...Just had game with dude who went 0 13 in 18 mins ,44 cs on ashe adc...But when I check his account it was like 29 wins 9 looses gold 1 smurf... What does this forum think about this subject? One more thing ,if you get permaban there is no reason to continue with this game...So if you get perma it is best for community and you to stop playing.
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