Champ select leave option

Hello, I'm thinking a nice addition to the champion select is a button that allows you to exit the champion select in case other players already prove to be really toxic. The button's function would be to look at chat of current champion select lobby and see if the other players (not yourself) are using inappropriate language and insulting other's in the team. If it finds the chat level to be toxic it will allow you to leave and thus by saving you from a toxic game.

What do you think? It is sad we would even need such an option. But if people can preemptively quit on toxic players, maybe those players would understand nobody wants to play with them. So they will either stop being toxic, or stop playing the game...