Why I am uninstalling LoL forever after these provisionals

We all know the league ranking system is broken, but this is just a #&%#ing joke. At the end of season 4, I was silver 4 until i stopped playing for a few months when school started and fell to Bronze 1. Then during the pre-season, I earned my way up to Silver II. Then my hard work is reset to unranked, but i figured Riot can't possibly to clueless enough for my Silver II rank to not matter at all after provis, but of course I was wrong. After having 3 games with an AFK, 1 with an 0/15 mid constantly typing LAAAAGGG all game, and me having above a 2.0 KDA for half of my provisional games, I end up with 3 wins and 7 losses. Silver 5 I could absolutely understand, but no, Bronze 4. Ya. No. I was in bronze 3 before, and I thought I already proved by climbing to Silver 2 that I don't belong in that joke of a divison, but clearly riot gives no @#^$ about being fair or balanced. There is no way I'm dealing with Bronze 4 because of AFKs and feeders in provisionals. Your ranking system is broken and there is no way I am ever playing this game again.