Thank you T. I've spent a lot of time asking myself those questions too.
It is possible for someone to be a wonderful person but do horrible things. A lot of it has to do with the context of the world they live in.
Not long ago people owned slaves in our country. Some 'great men' that contributed greatly to the world we live in participated in this atrocious practice. Not because they were evil, but because that was the norm of their society and they didn't think to question it, it was just 'how things were'. I'm sure I could think of many other examples dating back all through recorded history.
Well, in today's world it is a social norm that says it is ok to pack your bags and set out on a journey of independence to quest for your personal happiness. This is our cultural narrative. We are no longer chained by rules of religion or expectations that 'to be a good wife/husband we need to stick it out', because those beliefs were 'oppressive'. As a result in today's world it is considered totally acceptable to put yourself and your own desires above those of your family or community. In fact it is encouraged. This is 'freedom'.
Personally I think this has resulted in a tremendous degradation of some of life's most precious gifts and is a huge loss for the millions that will never know the joy of a lifelong committed partnership, that will never see a spring because we don't stick it out through winter.
But that's not the point right now. You were specifically trying to wrap your head around the idea of how a 'good person' could do something so destructive. Well, there you go. The world views the real destruction as the loss of individual freedoms so this is considered normal anymore. Your WAS is a good person that has bought into some very pervasive and horrible outlooks.
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15