Without comment about the moral arguments for or against porn, the idea that it's just pictures is tough to justify. Porn is designed to produce a very specific neurochemical response in people, a response powerful enough to lead to irrational decision-making (See Airley's book, Predictably Irrational).
The fact that people can (not necessarily will) get addicted to this neurochemical response is not only unsurprising, but well documented.
I also suggest you read what you wrote again. Sacrificing valuable personal relationships for something of lesser value is a textbook element of addiction, established by people who study addiction for their careers. But you say that letting your marriage fall apart over porn, which happens to people who are addicted to it, is just a matter of priorities? Can we say the same thing then about the meth head or the alcoholic? If not, what makes porn different? (And again you'll have a hard time with the porn is just pictures argument.)
Your assumption that I am "controlling" my kids to the point that they can't learn self-control is also pretty speculative. Can you point to the specific things I'm doing? Do you even know who my kids are and how I am raising them? The only thing you know right now is that I think filtering porn from their web browsing experience is good parenting. (For the record, my kids are 7, 5, and 2.)
Finally, I'll just ask the question directly. Do you have kids?