I think both points are valid, pornography is undeniably addictive and many people suffer with the problem, male and female alike, but personality has lot to do with it as well.
Different people are prone to different things, where one person is extremely confident and another is not, one person may have strong will power which helps them avoid these problems, another may lack that stength of will and therefore be more likely to suffer addictions, in a lot of cases the problem is made worse by the persons natural drive to find comfort in repetitve behaviour, that leads to addiction.
I don't think it is always about taking responisbilty, sometimes people who suffer addiction are not shying away from being responsible, they simply struggle to find the stength that comes naturally to others, these people need support more than anything, that's how they will get away from it.