On the matter of the porn, you certainly are entitled to your opinion about there being a god who doesn't like it.
But your other reasons don't support you. Addiction is bad, to anything. People can be addicted to porn, just as they can become addicted to sport, alcohol or eating. But if someone had one drink, you wouldn't be afraid of them becoming an alcoholic. If they ate one cake, you wouldn't worry that they would turn out to be a glutton. One porn link is not reason to believe there is a risk he will become addicted to porn.
Also, you are wrong in thinking there is a link between porn and sexual abuse. Can someone who looks at porn become an abuser? Yes. You wrote:
I grew up in a house with a step father addicted to porn and that guy got really sick in his brain. I can't tell you all the sick things he did, to even his own kids.
I did not want to see my son get tangled up in that kind of stuff.
But seeing as millions of people look at porn and don't go on to abuse others, the idea that there's a link between the two is as impressive as thinking there is a link between someone who sleeps on their back and then goes on to abuse someone.
If he's happier without it, that's wonderful. But it's only wonderful if the choice is his.
As for speaking on political matters and feeling the world is a negative place at times, probably only if he considers suicide or hurting others would I worry about that kind of talk. I personally find it theraputic to get things off my chest if they bother me. Keeping it in won't do him any good.
Those are just my opinions anyway- thanks for letting me give my side.