What do you think about women who are into Rhett Butler, and other "dark heroes" from romance novels?

Dark heroes in romance novels generally aren't disrespectful or aggressive towards the heroine, and if they are domineering or deceptive towards the heroine, it's generally motivated by something that the hero at least believes is for the heroine's good, and often at the expense of the hero's own interests.

For example, if a fantasy-romance novel heroine gets put under a curse that makes her terribly lustful under the full moon, the heroine might lock her up to protect her... even if she secretly wants to have sex with him anyway, and he wants her as well. Or in an adventure-romance where the heroine is a trained assassin with genetic superpowers, the hero might trick her into getting left behind when he goes to kill the bad guy, to protect her... even if his powers aren't as powerful as hers, or he has no powers at all besides his secret agent training.

Even if the hero is a bad guy with a past, his actions toward the heroine never turn out to be actually evil or unprincipled, though they may be mistaken and tragic for one or both of them.

(To be fair, romance has a lot of subgenres, and my knowledge is limited to skimming the books my wife has left in the bathroom over the last 20 years or so, and a handful of conversations with her about the emotional and sexual significance of the various tropes in the genres she reads. It's possible that things are different in subgenres she doesn't read, like "contemporary"; she almost entirely prefers ones with fantasy, SF, adventure, and other "non-realistic" themes, since this lets her get two categories worth of entertainment at once. ;-) But I'd be a bit surprised if it's dramatically different.)