>>44785801. /lgbt/ hands down, the board its self is centered around mental illness
2. /r9k/ comes in second place, but its not 100% full of mentally ill people.
3. /leftypol/ is full of self loathing trannies who envy those who can out do them. so even though is not a 4chan board, its probably worth mentioning.
4. /b/ pedos and guro fags, what can I say.
5. /trash/ because of zoophilia.
6. /jp/ because you have to be mentally ill to become a NEET.
7. /x/ and sometimes /pol/ because there are very dillusional people on both of these boards who are flat earthers and think nazi ufos are in antartica. Im not sure if they are trolling or have schizophrenia.
