You do you, I came to the conclusion a long time ago that anyone who says "I don't want kids" should be left alone on the matter.
On the flip side I think a lot of parents do this to themselves. Kids are not born knowing how to be polite, respectful, play well with others, etc, it has to be trained. It is an exhausting thing to train but it pays dividends. Ironically the less effort you spend on this the worse your kids get, making it even more of a misery to parent them.
Of course there are exceptions (I don't know if you were being serious/clinical with ADHD but that's one of them)
I don't know about a clinical diagnosis of ADHD, but in my observation, American kids certainly act this way, and have terrible behavior in general. You're right, this stuff has to be trained, but American parents have been failing badly at this for a while now.
I was recently in Japan on vacation, and by contrast, all the children there were extremely-well behaved. It made me think I might actually like to have a kid even, something I never feel when I'm in the US because kids (and adults too) are so poorly behaved.
On the flip side I think a lot of parents do this to themselves. Kids are not born knowing how to be polite, respectful, play well with others, etc, it has to be trained. It is an exhausting thing to train but it pays dividends. Ironically the less effort you spend on this the worse your kids get, making it even more of a misery to parent them.
Of course there are exceptions (I don't know if you were being serious/clinical with ADHD but that's one of them)