There is an implied threat and cohersion to it of "do it or else" or "I can break you too". That is the violence against the person. Smashing your own car in front of somebody's house wouldn't include that threat as it is their property to what they wish although it would make you look crazy.

I have a cane that I need to use to walk. Somebody breaks my cane. What is that?

Was the cane broken intentionally or unintentionally?

Such a scenario would be unfortunate. The lack of context makes it impossible to determine with any certainty.

It's something similar to buying up the rights for, and increasing the price of a life-necessarry drug by 2000%. Is that also violence?

I can see an argument that it is.