Exactly my point. You can hire more and more security - many of them fall asleep in the middle of the night anyway - you can install door alarms, you can barricade yourself in your room, you can do all that you listed, but the tiefs will still be out and about and scoring.
So, to keep doing what you are doing and to expect different results is simply idiotic.
Nail the SOBs! Catch them in stings and display them in public. Kick their arses around Redground. Post their pictures on line and on Telephone poles and humiliate them. Put them in a cage in the back of a pick up and drive them around town with speakers blaring. Throw them in jail. A Jamaican jail is a very effective deterrent.
Other thieves and would-be thieves would see this. If they know about stings and think they may sneak into a room that has a cop with a gun waiting inside they will be deterred. (In fact, they would probably be shot.) Remember, they are cowards.