So your saying that if a theif sees an empty hole with no stereo in it, hes going to break into the car anyway? That so wont happen..
Or are you saying the theif will be watching you take it out, and put it in the glovebox / boot / under seat, and break in when you leave? Well if youve got a theif watching your car that closely your [censored] anyway..
If you compare it to seeing a nice looking stereo in your car dash, he is far more likely to break in and nick it than if theres an empty hole there. Regardless of weather its screwed in and he cant nick it, you will still end up with a shafted lock mechanism / broken window / munted dashboard / damaged empeg. Just cover it up (skillz tony) or remove it. Surely thats the safest thing to do..