It won't, since it is not universally true, that seeing porn is not bad. There are thousands of personal accounts, or even a whole communities of people, who are trying to get rid of porn watching due to damage it brought to their lives.
E.g. I watch porn and I don't need their efforts on liberating me from it, thank you.
There are cultures out there where men were nothing more than a stick around their penis. I would personally not be comfortable with that, but presumably the people born in those cultures are.
Or for a better example of a perfectly above-board and healthy activity enjoyed by huge numbers of people that can become addictive and "a problem" - how about gaming?
(I'm not trying to belittle your point or resort to "whataboutism" here, just pointing out some examples from other industries).
The problem with porn is that it's sex and sex is dirty and bad and you should feel ashamed for having anything to do with it. /s
So yeah, like you, I'm not buying the entire "because some people are addicted" angle either. We are sold addictive substances all the time.