A Better Solution Than Report
I submit to you the conjecture if we change the report feature to "don't match with again" it would in turn make an overall better experience. I believe this will improve the experience of the game, naturally take care of the excessive reporters and reportees, and take away the individualistic view of when one is harassing, trolling, etc.
The experience of the game would change for the better if we had people not waiting till the end of the game to report, and rather if we combined a "do not match again" feature with the requirement that you select a new option to permanently mute a player In game. With this scenario a player would have to permanently mute the person they feel is undesirable, and it can't be undone in that game. If a player was permanently muted THEN you could select to never play with that person again. This would make people not able to argue in game if they wanted to take action after game to avoid a player.
People that report or get reported excessively will find a longer wait time to find a match. This keeps the burden on the people acting undesirably and doesn't affect the normal populous. It employs elements of natural selection instead of the special selection of the tribunal cases.
With this methods' natural selection type outcomes of your behavior, it eliminates the gravity of opinionistic views of the few. With special selection, the few are deciding to remove someone for the entire community. This creates a probability contingency that some players will be very unlucky and get banned from playing with players that do not appreciate their attitude when if they played with a different part of the populous they would have avoided even getting reported. This of course is a failure of the system that isn't performing in a fair manner for all.
Please lets give up on this report system and cut to the chase of what we want. That is not to play with the person we would be reporting. If you don't want that person to play ever again, not just never play with you again, because of how they treated you, I say you have some vengeance type attitude associated with this feeling; which we should not condone. Also if you don't want them to ever play again for the good of the community we must realise we are not all the same and what is offensive to some is fine with others, meaning we just can't decide for the community based off of our personal feelings.