Unfortunately, you are very mistaken. My older children are from a broken/blended home. I threw my ex-husband out when he became physically abusive toward me. The kids went through HELL with that man as he emotionally used and abused them for years. This went on until he decided to "sell" them to my current husband - if I wrote off the $10K he owed in back child support. My husband adopted the kids and only then did their lives become a bit more stable as his family accepted us completely. We were blessed.
However, my oldest never recovered from the abandonment and he still has problems. Nobody has it perfect.