Board Thread:False Info and Speculative Discussion/@comment-68.116.119.237-20150521065427/@comment-24989948-20150529111632

Jackson did not suffer from any inherit mental illness. His behavior prior to being bitten was caused when Derek scratched him looking for Scott. (this informaiton is available so "special knowledge" was not used) Teenagers have anger issues. Liam's problems were covered during Season 4 and yes, he does suffer from a mental disorder. However, fear and self doubt can intensify emotions and IF ( I get accused of saying fact even when using words like if) the s4 finale is an indicator, Liam has gained control and perhaps, allowing the transformaiton to cure him. Again, idea only and I could be wrong. As for Kate, I agree she was crazy, but within the show, it was never revealed if was suffereing from anything other than the great performace by Jill Wagner.

What it boils down to is that even werewolves and supernaturals have mental illnesses. The transformation can either amplify, cause or cure. What makes me wonder is how much influence did the Nogitsune have on the patients at Eichen House before taking over Stiles. It is unknown the extent of plans it put into action off screen.