... was lured from under a parked vehicle; half strangled; tortured and then set on fire.
Please do not tell me that you disapprove of the penalties which this fiend would face in Singapore - a severe beating with canes.
See? - No need at all to waste money on imprisonment. Perfectly within the Lex Talionis thinking.
Odds that he would be prepared to commit this sort of act again?
It's known as deterrence, BTW. Deterrence for him and all the other thugs who would not fancy a dose of what happened to him!