In low elo, people gamethrow simply because they don't know how the game works yet, or can't handle the chaos evils spread.
In high elo, people gamethrow literally out of personal reasons.
Last game I had a Transporter and Doctor refusing to cooperate. I was jailor and n2 I went around to gather role info. I'ved carried my buttocks from start (Silver) to nearly DIAMOND in 2 weeks using this method, and even in this game I proved my value by finding Jester, Consort and GF. Mafioso had died n2, and so it was only up for the last RM and NK. Night 4 I died by a surprise werewolf (no ww kills N2). Unlucky. There were 2 refusing to claim roles, because they didn't like my way of carrying the game. The first was pushed up the stand, still refused to claim because they whispered to someone else. Easy lynch, right. No they were Transporter, and their attitude made them so suspiscious they got themselves hung. (On top of that he was IMMENSELY toxic.)
Then we reached the endgame. WW was buddying up with framer posing as second Transporter, because WW needed him. Suddenly turns out. Suddenly a doc dies. He NEVER was on the jailor. His reason being; also because he didn't like my way of carrying the game. And yes, he did know I was jailor.
I mean, what the hell? I scooped away two evils, LO found the third (A consort) which made for an easy lynch, and we nearly won the game. We ended up losing because two strong town roles refused to play as a team just because they didn't like me asking for their role outside jail. Please tell me that this is genuine gamethrowing, so that my reports work properly so I don't have to deal with these kind of kids in this Elo anymore. Who the hell puts their personal problems in the way of a RANKED game?