Why is porn legal when it degrades women and damages men's minds?

It hurts the parents deeply of the women who sell their bodies for money (prostitution), it damages men's minds to only see women as sex objects resulting in a dependency for viewing ever increasing bizarre/ sickening sexual practices (addiction/ depravity) it isolates people from the need of the opposite sex since porn is a substitute for human sexual interaction, it results in disease for lots of the women involved, lots more kill themselves, it makes sex outside of marriage normal and increases abortion rates (murder of unborn children), the women involved end up having emotional problems after they leave, why are sleazy old men allowed to make money pushing depravity, addiction and poor morals?