Punishment for toxic players is very lax

I am curios as to why over all these years this has never really been addressed in a meaningful way. I took a fairly long break from league because I was honestly tired of going into a game to play and just see players yelling at each other. Whether its to blame someone for a death, blame the jungler, or just because someone is playing below the average of the group. What happened to rewarding players who actually take the time to try and help while suspending those who do not? Why can someone sit in chat and harass their teammates for the whole game to on receive a 24 hour suspension.

I have also seen some of my friends who after having someone be toxic in chat and decided not to play the game because most of us actually come to this game to enjoy it. So why do those players face bans for going afk when its because they just couldn't stand playing in the same game as someone that was that toxic. I just don't understand why the system has not really changed since I started playing this game 5+ years ago. Is there some system in place I am not aware of for this other than just reporting after the game?