I mostly posted because I feel a lot of people have bad relationships with parents that actually do love them but for various other reasons (psychological problems, poverty, stress, drugs etc... ) ended up just having a bad relationship with their parents.
I think it's absolutely worth it to try and establish contact and maintain a relationship if you feel that the relationship problems are superficial and underneath it all your parents do love you.
In that article, the mother lost contact with both of her children. It is not a trivial situation to be in when both children don't want contact. She must have done many things that were really serious and really horrible. But her last email she wrote that she loves both of them no matter what, and I think that is real.
What I am saying is that as imperfect as people are as much damage and toxicity they have done, if you sense that underneath it all there's genuine love then it's absolutely worth maintaining that relationship because you're never going to get someone to love you like this again. If true love even exists, it can only exist from parent to child.