If they have no fear, they wouldn't be wasting their time cutting grilles. They would be walking into Jusco during the day and rob everyone, rob the banks, rape the girls and bring back a few girls in your car as sex slaves, load all the loots in everyone's car in the car park and drive off slowly - one car at a time(laughing loudly when driving off).
Did they do that? Nope.
Why? They fear.
Knowing this, you can reduce your chances of being the next statistic of house break-in by;
1) Getting a unit away from the outer perimeter of the development, preferably in the middle of the development.
2) Install good quality security grilles.
3) Install good alarm system with sensors for movements, cutting vibration etc.
4) Eliminate dark corners outside your house by illuminating it. If electricity charges is a concern, install movement sensors which will activate the Bright Lights only when movement is detected.(Don't be surprised that many landed houses in Singapore have that)
5) Land mines and electric fencing (Just Joking)
6) As Lemans mentioned - Be vigilant, not paranoid.
Nothing can assure 100% prevention, at least chances are reduced.
Singapore's crime fighting slogan - Don't be an easy target!
Alamak... when i say "without fear"... Im not talking abt the extreme to the extend of walking into Jusco and rob everyone.... But i'm sure you have seen videos of robbers walking into coffeeshops with parang and snatching the patrons laptops and ripping off the cash register from the counter.... damn "Chang Kuang"
Do you have a good idea of how much would a good alarm system with all those features you mentioned cost? im now saving $700 per month for my renovation.... will need to budget this in as well... =\