I believe that no one is perfect. I also believe that we did not cause our MLcers to do what they are doing.
In a normal relationship, if someone does something the other doesn't like, both parties address it and try to work it out. Many of us probably had this earlier in our relationships. If, despite trying numerous times to work it out, it doesn't work, then both parties get a divorce and neither have hard feelings, because they know they tried everything.
No matter what, each of us has something to work on, something we could be better at or change. Part of it, though, is do we WANT to change that which someone else dislikes? I am a smart alek. I like tongue in cheek jokes, using movie and book references in every day life, and poking fun at the clutzy things I do. I don't want to change that, EVEN IF someone else doesn't like it.
I don't remember any of these sites saying that we contributed to the "destruction" of our marriages, just that we should look at ourselves and change the things we feel we should change. If we were too selfish or self centered, and we want to change that to improve our relationships in general, that's a great goal. If we are guilty of not validating what someone is saying (trying to solve a problem instead of just listening, dismissing their fears as unimportant, etc), that might be an area of improvement. It's just a good time for some self reflection while we are planning our unexpected future.
For myself, I was so busy taking care of everything, that my H stopped doing anything. I didn't realize how much more I kept taking on, because it wasn't getting done "fast enough". I was so busy, I didn't prioritize what had to be done NOW, with what could wait, or what I could pass off and let it be on his shoulders if it never got done. I now give him his own paperwork to do. If it doesn't affect my credit rating, not my problem. If he gets pulled over for expired tags, not my problem. If his laundry isn't done because it never made it to the clothes hamper, not my problem. I had taken away H's ownership of his own stuff. Did that cause the destruction of my marriage? It would be a pretty stupid reason if it did, when all H had to say was "Hey, I'd like to do my own paperwork, would you just leave it on my desk?"