As has been mentioned before, porn cannot make people do anything. Your argument that porn harms the morals of society is utter nonsense. People harm the morals of society.
Any parent could tell you what nonsense that is. What you pour into your mind determines what your values, determines where your moral stops are, determines what you see as acceptable.
A cultural diet of sadistic mass entertainments preceeded by live sex shows turned the Roman people from sober virtuous citizens into a bread and circuses depraved mob. History tells you what nonsense you are talking.