There was mention of the medication he was on making him "act crazy" a few days ago. This could be a psychotic episode but was the violence new?
His parents spent a huge amount of resource on helping him with his problems. That RR comment from the earlier interview mentioned all the dozens of therapists and doctors they had gone to. I'm sure this would have included some sort of psychiatric assessment.
There was also that comment about them all saying he was manipulating them and his parents realising they must be wrong and they should believe their son, hence the Being Charlie film