I believe that we are attracted to the toxic because in this generation people are addicted to toxic relations. Like we want to have fights, we are in need of feeling lonely or depressed, even causing scenes out of nowhere to feel good.
See if you look at the rose, you will be amazed by the color and the way it is made that when you will touch it you only then will realize the thorns where actually from the beginning there. People only see what they want to see, but sometimes what you are looking at isn't the one you need. You may feel like you are needy or you need to fix them but they are not in need of your help, and just like the rose needs to be thrown in the rubbish, you realize what a waste it was. The only bad thing is that you still stay there cause of the feelings and the love you grow for them.
What I'm trying to say is that we may fall for someone with a hard past which leads to a toxic relationship but it's up to you if you leave early or stay and make yourself depressed and used by someone you think it brings out the worst, even fights.