"It's not just "ok" to infringe copyright in such cases. It's an immoral act to fund such groups by making a purchase, it's your moral responsibility not to fund such groups, and it's an act of public service to subvert their capacity to continue to act in such a fashion. In summary, if can't put the money directly into the hand of the person who created the work, it's better not to pay for it at all, and it's better to help others to also not pay for it at all."

Following your logic, should you wish to sell your used car, I am morally obligated to steal it from you, because handing you money for the used car (1) does not put money into the hands of the creator of the work, and (2) does put money into the hands of an entity (you) which helps to keep the price artificially high and the commodity (free cars) scarce. So let me just do my public service and relieve you of your car, your laptop, your stereo, and other toys so that I can subvert your capacity to continue to deprive the creators of income and subvert your part in making these items scarce and not free.