Trolling isn't bannable

Just got a vayne jg who started with doran's shield at lv1, didn't make a single gank and went 1-9 while spamming "XD" in the chat BTW this was a ranked game not a normal The problem is i am losing LP bcs of a troll that doesn't even get banned or punished for what he did I am too tilted to say what riot should do about trolls . Those guys literally created a smurf acc where they troll until they get banned, except they don't get banned because riot isn't punishing them so they continue to troll players that try to climb ranked. My question is, should trolling be bannable?or should i lose LP because someone on my team decides to toll ?
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