Sorry but I am never going to look abuse, murder or rape and say "Oh hey, that's just a different and wonderous way of looking at life! Zipty Do Da!"
Well I wasn't going to go there, but since you brought it up.
Let's take a situation. Let's say it's an adult having sex with a 14 year old. Chances are an XNFP would simply argue, "That is sexual abuse and it is reprehensible and that adult should be in prison!" Many very good arguments could be made for that point of view. For example, there is a power imbalance and thus it is inherently coercive, and a 14 year old would probably not have the experience necessary to make good decisions. So does that mean a 14 year old having sex with an adult is universally wrong? An XNFP probably would say yes because their internal moral standards say so. An XNFJ would have a much more complex view.
First they would look at a culturally relativistic perspective. Has it always been wrong? Well, no, obviously people used to live much shorter lives, so it wasn't uncommon only a few hundred years ago for people to get married as young as 14. Is it the same everywhere? Well, no, countries like Spain and Denmark have ages of consent as low as 13. Well is it wrong in every situation? Well no, I remember not to long ago reading about a case where a 13 year-old tricked a 20 something year old into believing she was 18. Is it harmful in every situation? No, there are people who have had sex with adults when they were as young as 14, and they haven't suffered any difficulties as a result of it.
Now does any of that mean that we should accept an adult having sex with a 14 year old? Absolutely not! It doesn't dismiss that in this country, in this culture, at this time, that there is usually a power imbalance and thus it is inherently coercive, and a 14 year old would probably not have the experience necessary to make good decisions. But if I were to encounter a sexual offender who had been convicted of having sex with a 14 year old, I would want to know their situation rather than just condemning them for what they did.
I would want to know what their perceptions at the time were, how they had been raised, what culture they had grown up in, what were their experiences, and what values they held. For example, it has been found that most sexual offenders were sexually or physically abused when they were younger. Many came from tough backgrounds. A common profile trait of a sexual offender is a person who has trouble establishing healthy adult relationships. A few even come from cultures where a 14 year old having sex with an adult wouldn't be a big deal. Now of course, none of that changes the previously mentioned arguments, and so within this country, they still would have broken the law and will have to deal with the consequences, but knowing their situation would help me to sympathize with them.
Why would I want to be tolerant of people who engage in behaviors that I perceive as harmful? Because, they are still a human being and deserve to be treated as such. No situation is usually universally wrong, even if it is wrong in this country, in our culture, at this time. And people may have many reasons for behaving the way they do, and people should be respected for having different beliefs and perspectives, even if we find their behaviors to be harmful.
That doesn't mean I think it is ok for an adult to have sex with a 14 year old, nor does that mean I advocate lowering the age of consent, only that I am tolerant of people making their own choices and I realize that what I percieve as "wrong" or "harmful" may not be that way in every single case.