I don’t know how to explain this to old people, but relationship breakdowns per se don’t fuck kids up, emotionally unstable parents do that all by themselves.
If the splitting parents remain emotionally sane and sensible kids can deal with anything. Even the end of their parents marriage.
Unfortunately, many relationship breakdowns are due to a lack of emotional stability. That emotional instability most often contributed to by a pair of fuckwits.
A correlation is born between the split and the subsequent kids fuck up. In fact those kids were screwed in any case.