Something needs to be done about players who abuse the mute function

I just had a game where our fizz muted the entire team at about the 5 minute mark, because 1 player accused him of not watching the map (fact, he did not assist our jungler when the enemy shaco invaded. Twice.). Even if there was nothing the fizz could have done, he just needs to calmly state this, and move on. Instead, he announced that he would be muting us, and promptly left the chat. We ended up losing the game due to the obvious lack of coordination.

Now, obviously the mute function has its place. When someone is spamming chat or being toxic, by all means mute that player. However, when someone shows some salt over a play that you may/may not have been able to assist with, or gives you some justified (yet potentially unwanted) criticism, I find that muting that player only adds fuel to the fire. ESPECIALLY when you announced in chat that you are muting said player.