Drunk, high, or somewhere in between? :?
(gezz what a futz)
He can pay for damages and go without carrying in public for about 6 months, so as to remind him of the responsibilities he failed to uphold.
Also, mandatory training and re-training on his dime required every month of his probation, to re-teach him safe handling practices.
That should hammer it home.
If not, he needs to not carry.