(Assuming it's really from them etc.) If they were this bad at taking responsibility for the stress in their life with regard to you, imagine how bad they were

(Assuming it's really from them etc.) If they were this bad at taking responsibility for the stress in their life with regard to you, imagine how bad they were at handling all the other, more basic and visceral, sources of stress they experienced and refused to take ownership over in their life. They could write a hundred such messages to people they interacted with (and probably did?).