Some people think police should pay for the abuses that they regularly and without punishment do.
Some others think police should stop existing in general, or exist only in a very limited capacity, or be replaced by citizen patrols, and several other varieties...
So, that morality and cause... Doesn't have to agree with yours to be a morality, and even less so to be a cause...
Yes you do. You might not get away with it, but that's not really pertinent.
In fact historically most change happened through people breaking laws because of their beliefs and anger.
And in every past society, like ours, most thought its laws are the apex of law-making, and should never be challenged or broken in anger, nor its law agents assaulted etc. Only history doesn't work that way.