I know about as many angry and bitter liberals as angry and bitter conservatives even considering I know far more conservatives than liberals. At least from my perspective the "angry and bitter" is a trait universally applicable, though not universally applied.

The people vs property is an interesting subject. While damage to people is certainly worse than damage to property, doing damage to people or property is a manifestation of anger and bitterness. None of the people I consider anry or bitter would even think of doing such a thing, left or right. So for your Broszian generalization I do think you can discount those individuals, but still think your generalization stinks of bias.