[KNoureen]

Not entirely true, the world is not that binary.

I can't remember where I read it, but a locked door is quite effective in preventing burglary as forcing the lock or crashing a window would greatly increase the chance being detected.

[madez]

In my country the rate of burglaries is currently sadly rising and the police advices homeowners to invest into security measures like doors, enforced doors, enforced windows and cameras. They say that most burglars stop if it's not easy for them.

[cmdrfred]

What is highly effective is you having locks and your neighbors having none.