Does anyone understand the psychology of the enabler parent?

My dad left me alone at 13 to be abused by my mother for years. He remarried to a woman who talks to him like he’s a piece of sh*t. I believe she may have a personality disorder. He clearly has a type. She’s also said inappropriate comments to me. When I’ve confronted my dad about it he constantly says “she means well”, “she has a heart of gold,” etc. My dad is a “good” guy, he’s quiet, “kind”, works hard. But it seems like he has zero backbone I don’t understand.

Just as we have understanding of BPD psychology, can anyone explain why enablers do what they do??

My dad left me alone at 13 to be abused by my mother for years. He remarried to a woman who talks to him like he’s a piece of sh*t. I believe she may have a personality disorder. He clearly has a type. She’s also said inappropriate comments to me. When I’ve confronted my dad about it he constantly says “she means well”, “she has a heart of gold,” etc. My dad is a “good” guy, he’s quiet, “kind”, works hard. But it seems like he has zero backbone I don’t understand.

Just as we have understanding of BPD psychology, can anyone explain why enablers do what they do??