Obvious that Charlie's killer did no act alone. I tend to think that like Pres Trump, Charlie was so effective, that he became a most critical for target for sinister forces,
and the stupid kid was just the "groomed assassin"....
For we do not wrestle against flesh and blood, but against principalities, against powers, against the rulers of [a]the darkness of this age, against spiritual hosts of wickedness in the heavenly places. (Ephesians 6:12)
...And those sinister forces have earth bound allies..