>Why is internet porn unique in this respect?
Because of privacy.
Why should the porn company and the government be allowed to track what I do in private?
And now to your other silly points..
Alcohol is literally damaging to a developing brain. So there is a completely valid reason that children should not be drinking.
Gun- a child with a developing brain that doesn't understand everyone can literally kill themselves or someone else.
Rent a car.. see gun- car can hurt people.
Strip club- oh no, a naked person! How terrible!
Vote- see developing brain- a 10 year old is generally not informed in the slightest or capable of making a decision that will affect other people
All the shit you list affects OTHER PEOPLE. Watching porn doesn't affect anyone else.
>Our society is FULL of porn. It's everywhere
Gee I wonder why that is... PEOPLE LIKE PORN. We are literally sexual beings- it's the only reason you are alive, because people and other animals before you have been fucking like mad for billions of years. And we like to watch people having sex.
So get off your high horse and deal with reality. You don't like porn? Then don't fucking watch it. You don't want your kids watching porn? TALK TO THEM ABOUT IT and do whatever you feel is necessary.