So, can't shoot the SOB, you'll goto jail. Can't prevent 'em from driving away with well palced shots, that's willfull destruction (and probably still get's you in jail for discharging your weapon and endangering the life of the poor misguided perp). Watch them take your earned property (and if they wreck it), your penalized with higher rates..
I wonder how much I can get a silencer for? That would give me the crucial time needed to just drive away myself with the perp in the backseat...dump their asses somewhere else.