It's really simple, which is why so many here are working so hard to strawman me.
The Protest comes first: a group has a grievance that it makes known to the people in a position to remedy them. All protests are meant to be disruptive, meaning that they all cause property damage, and be it only in the form of loss of income and increased costs for security and possibly scabs.
If that isn't enough pressure, very targeted vandalism is the logical next step - the goal is to make it more costly for those in a position to fulfill the protesters' demands to refuse than to give in - it's the same for any Strike action.
It's plain lazy to read this as carte blanche to damage property with no connection to the protest, as it would have Zero impact.
Seriously, it's plain to see that most Americans have no clue how to protest.