Which is not to say that it's never the fault of the parents/owners. It probably is, the majority of the time. But to suggest that as a universal law, as you have done, is silly.
This is bulverism. You haven't presented evidence that tw04 is wrong. You've just assumed they're wrong, and presented a condescending explanation for why.
https://en.wikipedia.org/wiki/Bulverism
And as they said, you're not actually disagreeing with them.
And "very rare" was a comment on "99 %", not a quantity on its own.
HN is the one place where I expect readers to interpret numbers literally.
Would you describe a random number generator outputting 5 when picking between 1 and 10 as "very rare"?
1/10 != 1/100 != "very rare"
This is not unique to kids and pets. It is why even experienced athletes have coaches, for example.
Ironically enough, the exact same consistency and discipline are pretty vital for a child as well. They need a little structure in their lives to feel secure. (No, I'm not talking helicopter parenting or scheduling every second of your child's day).