Rights are basic, inalienable:
11. But first We must speak of (human) rights. (A person) has the right to live. (A person) has the right to bodily integrity and to the means necessary for the proper development of life, particularly food, clothing, shelter, medical care, rest, and, finally, the necessary social services. In consequence, (a person) has the right to be looked after in the event of ill health; disability stemming from … work; widowhood; old age; enforced unemployment; or whenever through no fault of (her or) his own (she or) he is deprived of the means of livelihood. (Cf. Pius XI’s encyclical letter Divini Redemptoris, AAS 29 (1931) 78; and Pius XII’s broadcast message, Pentecost, June 1, 1941, AAS 33 (1941) 195-205)
I don’t know if there’s much more to say. Violating a person’s rights is becoming an active agent against God. Unjust? Sinful? Demonic? Probably all of the above in the most serious of cases.