Protest and looting are shades of the same idea. If you don't care about us taking up space in your streets, maybe you may care about being deprived of your corporate assets. Corporations aren't people. People are people. If harming corporations leads to an increase in human rights, that is a net gain for society. To question whether the cost is too high like you do shows you care more for property, capital, and the people who wield these asset classes, than you do for those who have cause to protest. Just because you don't share their cause célèbre does not invalidate it.
Reasonable people can disagree. It's impossible to be reasonable or disagree if you're killing someone or being killed. The police actions up to this point have been unreasonable, and so the response of the public is currently outside the scope of actions that can have a reasonableness standard applied to them. Protest is inherently justified by the Constitution. The response to police brutality and lack of internal reform proves the police think they are right to kill people and don't need to change. That's why the protests continue. To stop protesting now would be to negotiate with terrorists. The protests must continue as long and until the police come to the table with protesters and stakeholders, and they all negotiate a solution.