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By seeking to divert responsibility from the car thief to the car owner, this sign and signs like this are engaging in Victim Blaming. If you leave valuables exposed in your vehicle, you are asking for it, and the asshole who smashed your windscreen or side window to steal your stuff is absolved of blame - because we know car thieves lack free will, and are unable to resist whenever they see valuables lying in vehicles. Car thieves are entitled to steal any valuables they see exposed in vehicles. Car theft seems to be the only crime where it’s seen as ok to put the victim on trial.
Car theft apologism and hatred of car owners is clearly evident here. If you own a car, you are not sovereign over it - it is your responsibility to cover up valuables. Nevermind the principle of private property - your car is not yours to do with as you please. Are we living in Soviet Russia? Every car owner has the right to leave his car unlocked and expose his valuables in his vehicle, without the fear of car theft.
Whoever designed this poster is clearly a weeping syphilitic chode. Perhaps he is even a car thief himself.
We need to organise mass protests where everyone will leave valuables exposed in their vehicles. That will show them!
We can call them "CarWalks"
Here are more revolting examples of Car Theft Culture:
Addendum:
(this one has the revolting line that "Auto burglaries are the number one victim-assisted crime and they can be prevented!")