Deadbeat significant others

I'm noticing a lot of women complaining that their significant other's are total assholes. Here's what I usually see...
1) SO is talking to other women and/or cheating because I can't have sex because I'm so miserable with pregnancy
2) SO won't get a job. 
3) SO won't stop doing drugs and spending money on drugs. 
4) SO makes me feel bad because I'm pregnant and too miserable to keep the house as clean as I used to, or cook or have sex. He's been very verbally abusive. 
I even saw someone write that their SO tried to run them over with a car!!!! Another woman said her husband is verbally abusive to her autistic child from another man and calls him a retard!!! WTF!?!?!?!
So, why do you all think it's acceptable for men to treat you this way? Why do you get PREGNANT by these assholes (to those who planned pregnancies)? I was in a verbally abusive relationship with a man who had bipolar disorder when I was 17-21. I would have NEVER purposely gotten pregnant by him. And I certainly didn't stick around long once his abuse got out of hand. I woke up one day and realized I could do so much better. I spent 3 years finding myself and staying away from men in an effort to figure out what I wanted out of life and in a partner. And eventually I found my husband who treats me better than I ever thought possible. 
You don't have to put up with anyone's shit!!!! You CAN and WILL do better!!!! 
Why do you put up with it?!!