One could also argue that the near ubiquitous availability of porn is simply allowing men to get what they want without a lot of hassle. Namely dating, courtship, and maintenance of a girlfriend/wife who, while attractive, good company, and (hopefully) a very good friend, simply does not live up to the task of keeping the mans sexual drive satisfied.
Porn addiction should be looked at in a couple different directions.The first is the direction that is being talked about so far in this discussion, namely of men who can't control themselves and spiral out of control with an addiction.
Another direction to look is what kind of family life does he have? Does his gf/wife make sure to tend to his needs? Does she care enough about him to get interested in things that he enjoys, sex among them? If there is sex, is it kept interesting? Or has it gotten incredibly stale and any attempts to make it interesting have been failures, either because they just didn't work, or worse, because the woman had no interest in exploring those options and simply expected the man to be satisfied with what he had? Or is this man in a worst case scenario where he has tried his best to find companionship, only to be left out in the cold and judged as not worth anyone's time in a relationship?
What a lot of people need to come to terms with is simply that people have sexual urges. For extensive periods of time our societies have placed a great amount of weight on suppressing those urges and judging them to be "unclean", meaning that only the boldest or most well connected had access to avenues of sexual experimentation. Now with porn literally everywhere, everyone can experience, at least at a distance, almost anything sexually imaginable. The game has changed, quite literally.
With sexual freedom comes a lot of people discovering urges they may never have been able to realize they had. And to be honest up to this point the majority of those people discovering themselves sexually have been men. Women are getting there, but it is taking them longer because of natures built in sexual imbalances. And this is one of the main parts of the problem.
Men have discovered that they want more than to just take a girl out to dinner and a movie on a regular basis, and if they are lucky, they get to have sex on rare occasion. Men have discovered that they want to have sex a lot more often than in the past and women are taking a long time to adapt to these new sexual demands.
Women hold the keys to the sexual kingdom quite closely and refuse to open the gates unless great sacrifice is made in order to get there. Men have simply started to decide that the price of admission is too high, and they are choosing substitutions that are more easily accessible.
As misogynistic as it sounds, the porn problem is caused in part by women making themselves unrealistically unavailable when demand has never been higher. The same thing happens in any high demand, low supply market. High demand and unavailability of any alternatives means everyone competes tooth and nail to pay top dollar for one unit of the coveted item. Then something else that works to satisfy the same demand comes along and suddenly everyone starts to wonder why they're paying out the ass for the cow when the imitation milk is damn near free.
It's simple economics only with sex as the currency. Men want sex but are tired of having to pay for the hassle of dates that may not be enjoyable, relationships that become stale after so long, and escalating costs for lower and lower returns. Until women start to become sexually open as well, porn will continue to be a huge problem for society because men gotta have it, and now they don't need women to get it anymore.
Porn addiction is the end result of mens biological imperative being artificially suppressed for thousands of years by societies that looked down on it and left most men with little to no way of actually expressing it, and suddenly removing that suppression by way of all manner of sexual experiences suddenly being a click away.
Men have adapted to porns availability and now demand sex in high enough quantity to actually keep those primal drives satisfied. Society needs to adapt to that, or porn addiction will become more and more widespread as men choose easy access to jerk off material as opposed to the high cost of empty relationships.