Society and the rules that hold it together is built on mutual trust and cooperation. In order for it to work people need to feel that those rules and social constructs are fair and reasonable. Morality in turn depend on people feeling that rules and social constructs are fair and reasonable.
Not paying taxes is wrong and theft. Peoples willingness to pay taxes depend on how much trust they have in government. A government that is general corrupt, do not represent the people, will result in people seeing tax collecting as wrong and theft. Not paying taxes is thus morally right and the self defense. The whole definition of right and wrong, theft, morality in general, depend on trust and the social constructs. One can not discuss morality of choice without talking about morality,
Viewing theft from a grocery shop as morally good necessitate that a person view the existence of the shop to exist outside of the social bonds and constructs of society. A modern approach to crime reduction is to increase the social support and social connections for people in high crime areas (the social part of social economic status). As is often found, harsher punishment for crime do not often reduce crime, which is partially explained by the social economic status model.
Viewing copyright violations are morally good only necessitate that a person view the current implementation of copyright to exist outside of the social bonds and constructs of society. I see maximalists of copyright as to be extremists that lives way outside of social norms. That those maximalists happen to have deep enough pockets to bribe politicians, and politicians are morally bankrupt to accept the bribes, is just that. Somewhat it is actually a simple moral choice, and those choices were wrong and made by people who should have known better.