You do realize that most cases of vandalism never have so much as a suspect, let alone a confession or honest motive. Slashed tires, sugar in gas tank and a smashed window ALL happened to a coworkers car. It happens. It really doesn't matter what the motive is. He was specifically targeted by someone with a vendetta. His car suffered the consequences of that vendetta, and while one specific individual WAS suspected, nothing was proved, no arrests were made. All repairs came out of pocket until the sugar in the gas tank wrecked his engine, which made the repairs cost more than the cars was worth.
A lot of vehicles get damaged, deliberately. An NRA sticker might be enough to motivate an anti gun idiot to vandalize my vehicle. Not worth it. Why give thieves or vandals a reason to try to damage my vehicle?