Along the lines of what other people have said here…
It has been found to be statistically important (I dont like to say true cuz nothing really is that simple) about divorced vs. married but unsuccessful/unhappy couples and their kids. Kids can be worse off from the latter than the former. We just spot divorced couples and cannot always tell the others out. Look into every family and while you may never know the story until after a chasunah, you may get a clearer idea about the children’s mental health status.