You can convert non-productive people to productive people, most of them only want to be noticed or acceptedI'm a moderator of multiple online spaces.
A few months ago, in one of them, a user got too heated and started flinging insults at someone else. As was standard policy for the place where it was occurring, I issued the user a ban of a few days (enforced cooling-off) and pointed to our guidelines on how to behave.
This user then proceeded, over a period of months, to continually harass me, send me increasingly graphic threats, and try to track me down in real life.
Pray tell, how exactly would you go about "converting" such a person to be productive? I come to you since you are apparently quite the expert on it, or else you wouldn't be giving out advice to just "convert" people.