I don't see what the problem is.
I leave the key in mine all the time, and I even leave it running when I go into the gas station to pay.
OH!! I forgot to mention that I live in a small town and know everyone and they know me, and my GUNS.
Just in case though I have a CCTV camera hidden in the vent and one on the license plate that looks like a backup camera linked to my computer/phone.
I don't mind telling anyone because they can't defeat it, it's motion activated and has it's own seperate power source so even if you disconnect the battery it will still work.
The cool part is I can activate it remotely and see who's nosing around the car or just checking it out.
Bottom line is if someone. IE; a professional car thief wants the car they will get it, even out of your garage in the middle of the day or night if they want it.