Banned of verbal toxicity*

One thing I really do not understand with the league of legends ban system is the fact that if you are toxic and the other person gets "offended" that they then reported. Not against the reporting. What I have a problem with is how they have the capability to chat restrict people yet do not do it choose to permanently chat restrict someone if they are verbally toxic. Someone being toxic can be muted but someone who intentionally feeds cannot be muted, that affects the entire game. In summary, I feel as if the mute button loses purpose if you can just get someone banned for what they said because either way the person has read that message. Instead of people who are toxic being unable to play make it so they just cannot talk as much.