Three strikes and you find yourself beamed into a beam-out-proof holding cell for half an hour game-time? Bet the public harassment stops REAL quick-like.
Why just a holding cell all alone?
Crank their difficulty to Elite, beam them into a cell with unlimited respawning borg, and bind their respawn there. Set the timer for 30 in-game minutes (increasing the timer by 30 minutes for each additional infraction)and let them die over and over and over again while the injuries rack up. They can not logon to any other character or do anything else until they serve their time.
Binding death loop GM punishment... I think it is time to make a comeback.