I feel like I want to defend Lois. Yes, she treated Meg, badly. But, that's when it was cool to do that, Back then, did did it less, than the rest. And she's still more sane that others, especially her husband.
Was there ever a GOOD parent in South Park? Remember, this shows derails ALL adults.
And is "Mom" from Futurama an actual mother, or is it just a gig?
You know, Chi-Chi from Dragonball Z being an actual mother is probably the reason why many fans hate her.
"D**m it, Chi-Chi! Just let your son save the day, so you can be alive for tomorrow!"
This may also be why Mangakas don't bother with parents in manga. Actual, full, fledged parents are considered boring and don't sell well.
Also, writers hardly know about parenting themselves.
And seriously, not many adults wanted kids in the first place.