I was jailor. After executing 3 evils, I jailed someone who I don't recall claiming...then as soon as the night began I realized they were the rezzed BG. I'm like "sorry". Next day, the retri decided to lynch me for being a "dumb jailor". And it almost worked! There were 7 players and instead of lynching the last mafia, they voted me, and I got 3 votes!
Please, just because a townie makes a mistake does not mean you should gamethrow! The only time it's justified to kill a townie is if them being alive endangers town's chances of victory (such as a gamethrowing mayor, where vig has to shoot them to ensure town victory or town loses). Making a mistake is not gamethrowing, but lynching someone based on that mistake is!