Completely confused why couples brings kids into shit relationships

I follow a bunch of relationship subs on here, but I see it IRL all the time and this seems to be so common:

“We’ve been married for 6 years, it was good for one year, since then he’s been borderline abusive and I’m not sure he even likes me any more. BTW we have one 3yr old and another baby on the way. How do I get him to be nice to be sometimes?”

Like, what??

You had a few good years of relationship, the. It got shit, then you started adding kids to it? How does that help in any way?? Now you’re just stuck to him forever and you’ve wedged two brand new humans into your shit show too.

I do feel sorry for people in this situation, but there’s this loud voice in my head yelling “YOU MADE THIS INFINITELY WORSE FOR YOURSELF”. Are the urges really so strong that you lose all reason? Bonkers.

Completely confused why couples brings kids into shit relationships