The appropriate questions to ask are 1) How did AIDS infected blood get into the blood supply, 2) How did the woman giving birth contract AIDS?
Try to tell a woman who was raped that pornography just affects those who consume it.
Pornography is no more the cause of rape than guns are the cause of crime. The rapist is the cause of rape.
Try to tell a child growing up in a broken home with a broken heart how harmless adultery is to him or her.
As if making adultery a crime under the law is going to ensure happiness in a child's life. The home could very well be broken as a result of an infinite number of other factors and abuse could take place even in the absence of adultery. No law is going to make a parent a good parent.
We all pay for the consequences of other's sins.
It is a common tendency to view other peoples' problems as a societal problem, requiring a collectivist solution (which often entails the subjugation of rights). If people make irresponsible decisions in their life the consequences are theirs to bear. If the consequences cause harm to others then the individual responsible should pay restitution and/or be separated from society.
...there is no such thing as a 'harmless immorality.'
Who said there was?
People infected by engaging in sodomy and shooting up drugs donated blood.