Process of Punishment [in the Tribunal]

God I hate the tribunal.
It's the reason I quit LoL.

It was also a pretty bad week for me connection wise.
I just, I cannot agree with a system that puts decisions like that in the hands of the players.
Report abuse, AND Vote abuse, also compound my personal issues with the system.
What measures are in place to stop someone from voting to punish someone simply because the voter was in a foul mood?
Is there anything in place to ensure that the voters are completely unbiased in how they vote?

It's just a pomegranatety system in general.

No offense, but I do question your "story" about how you got banned in the first place. In other words, you're definitely hiding something that we don't know about (and feigning innocence at the same time). Driving your friend to the hospital (and having to bail out of the game as a result) is an understandable emergency, an extremely rare occurence, and you are unlikely to get banned on that leave alone. However, you're likely to get banned for things that you have done in-game that violated the Summoner's Code.