Lock the thieving knob-head up for the full 5 year term, plus the THB 100,000 baht fine, and dont release him untill it is paid in full! Then Deportation an blacklist him for life!
Maybe then he will re-consider his actions in the future...
In my humble opinion, all police officers, everywhere should be armed with at least a Taser, but preferably a Glock, or something equaly as lethal, with a safety feature such as: https://smartgun.com/ to prevent someone stealing it and using it on the legal owner.
Plus the death penalty should automatically apply the anyone (male / female) who knowingly takes another persons life, ie Murder!
Or is convicted as a Pedophile!
But that is a discussion for another day...