Yep... why are we drawn to toxic people?...................
............ too many reasons.
The concept of "the chase" is one that comes up a lot. We want things that we can't have and the most toxic people frequently make us work to be with them or even just be in their presence.
They tend to be very aggressive at shifting blame and passing off their problems as not a big deal. "The way you acted made me do it", "it's just the way I am, so don't worry about it" -stuff like that. And for whatever reason most people are really bad about buying that obvious bull.
Your trying to be the good or bigger person and you think you can get through to them. Sometimes it's just us trying to be the one who gets along with everyone. Sometime you think if you just say the right things you can get through to them and make them better, in spite of the fact that that has worked for like %5 of people.
They tend to be exciting. Toxic people are, frequently, possessing traits that our society generally obsesses over. Extreme extroversion, assertiveness, confidence, and we don't seem to realize none of these qualities are either good or bad and none of them justify the toxic personality.
If you grew up around toxicity you tend to be more vulnerable to it. Even if the toxicity wasn't terrible like, you had a slightly over-dismissive and aggressive parent who wasn't that bad? You'll be more likely to accept toxicity, even if it's far worse then what you were exposed to.
Because of how common it is for people to excuse and even fall for toxicity I've decided to make it a big part of my comic's story to show characters who take the more sensible actions when dealing with toxic characters. Honestly, I think another big issue is a lot of our media loves the traits frequently possessed by toxic people. We're kind of trained to love them, so I think more writers should be teaching people to react sensibly in regards to these kinds of people.