Agreed, though it's not just being married irresponsibly that causes such problems, it's also having a romantic relationship right after your divorce/separation that's a problem, especially when you bring a new life into it. Nobody in my family has ever been married save for my maternal grandparents and paternal aunt. In fact, I was born 3 years after both my parents graduated from college and my sister was born when they were already tired of each other. Well, my parents had a nasty separation when I was 9 (they weren't married) that didn't end well. My mother soon got involved with this coworker of hers named Vincent who eventually moved in with us. He wasn't too bad in the beginning, but after my half brother was born less than a year later, he started screaming at us and beating us. He never physically harmed my half brother(in fact, he spoiled him and put him on a pedestal), but my half brother was very afraid of him. He forgave his father, but he still feels tremendous guilt because of what his father put us through(he's going to be 12 in April). My stepfather's been out of the house for 3 years now (he nearly killed my sister), and my parents have made up, but they didn't get back together. They actually get along better than they did when they first got together and had me.
I know this stamp talks about irresponsible marriage, but even living under the same roof with someone you barely know(a romantic partner of course) is a problem. And yes, having kids in such a situation makes it worse, because too many times, the so-called stepparent acts as if they're God's gift for reproducing and treat the kid's other biological parent (usually the mother) and the older half-siblings like complete and utter shit. I've even warned my brother about getting involved with a woman with kids or getting involved with someone right after he's become a single father because I don't want to see my future niblings (nieces and nephews) go rough the same thing we did. Thankfully despite being coddled by his dad and despite witnessing all that violence, my brother's such a sweetheart, and is really sensitive. As for my sister and mother, they're both okay, but none of u can truly forgive my stepfather for what he's done.