Thoughts on an unfair system

I just wanted to share my frustration towards the punishment system when there is no clear understanding of how it works.

Yesterday I played xerath against a player who didn't like that we dominated him in lane and started feeding and walking into our base to finish with a 1/16 score. He also started all chatting on his own and throwing racial insults. We all reported him and absolutely nothing happened, he is still enjoying games today.

Now before season ended I went 0/14 as taliyah jungle in a normal game and was pretty tilted from being hard stomped in my jungle by every enemy laner and jungler from the very first invade. I couldn't even do my buff anymore and got executed after that I kind of disconnected my brain from the whole thing and just kept getting executed by my jungle camps. I probably died 3 or 4 times to enemies in total. Now after this game I immediately got a 14 day suspension for intentional feeding. Very well I didn't get end season rewards or anything but tough luck I guess but imagine falling a couple of weeks after on a guy doing the same thing and getting away freely.

How is the system fair when you see stuff like that? What was the difference in our feeding except I died to jungle camps and him to my allies and myself? What goes into such system decision to choose who gets banned and who doesn't?