I don't think that the harm of breaking windows is solely due to violation of private property rights. Maybe the windows are on a publicly owned building. Or, even if they are private property, there is harm done to the public as a consequence of the damage. People will take steps to avoid such damage. And conversely, maybe the mining of Bitcoin harms public interests too. I think it's easy to just assume away the issues that go beyond private interests if you identify morality with sacrosanct property rights.