Good article. I know that it took me a long time to figure out that certain people were just going to cause problems and drama and issues no matter what my actions, and though I might feel sympathy for them and want to help them, there really was nothing I could do. They had to want to be helped or to change or at the very least be responsible for their own actions and how those affect others.
I finally removed all of those people from my life, and have pretty good radar to see when somebody is just not a healthy addition. My life has been amazingly calm since then.
It's amazing the amount of guilt tripping people will do when they realize you are not playing their drama-filled game anymore, though. It used to affect me more, but I've been guilt-tripped by near professionals (my psychotic and crazy family on my mom's side) and I no longer have the ability to feel guilty about protecting myself.