Lucas is guilty of telling others to commit suicide, and making death threats as well as deleting evidence. Thankfully I was able to archive some stuff and screenshot the rest:
Well yes, but if you notice Cerulean provoked him (i'm neutral AND MAD AT CERULEAN FOR WHAT HE DID TO ME LAST NIGHT but still neutral just pointing that out)
Valid. However, even if skies provoked it, they technically didn't break any rules besides possibly trying to start a war. Lucas on the other hand broke several.