She didn't mention the abuse as the reason, but her fear for own life that she was unable to take them off.
Zoro seems like the type to risk it even if he had same experience of parental abuse and incarcerations
But internalizing issues is a common thing in these kinds of abuse.
But my point is:
There are multiple ways you can work with the "willpower" theme in fiction.
There's the case for Zoro, who always will be at the high end of willpower, "never give up", etc. If he dies, he dies on his own terms. Like the wax part in little garden, asking for Kuma to take his life instead of Luffy's, etc.
There's also the "bouncing back" theme. Was recently shown in Sanji's ordeal during WCI. Take a seemingly non-vulnerable character, shatter his world completely, throw him in the deepest sense of "I can't do anything" possible, than bring him back up, usually with the assistance of someone else (Luffy).
And finally, the "unbind the shackles that have always binded you" theme, which is the most commonly used in One PIece. The difference for the second example, is that the character starts its "downfall" already in a state of vulnerability (usually by being a child thrown in a difficult situation). Nami being forced to work for Arlong, Robin being used by criminal organizations and being hunted, and now Yamato being imprisoned by her own father.
I think all of these are valid ways to work this theme and each has its own merits. Which is why I don't discard the possibility of Sanji having CoC due to some past situation that would make it wrong. I don't consider the possibility merely because I don't actually like it very much. LMAO.
Now, all of this is kinda pointless because One Piece is Oda's story. It will depend entirely on what he thinks it should be. So....yeah...there's that.