Probably yes and no. IF I had to take care of a whining, bratty, ugly, smaller version of me for 18-20 years I'd want to be left alone with my girl and never see me ever again, but then again I love me, and I'll love my kids when I have them, because they were once me and are still me

Yes they do. Once they know their kids are capable of taking care of themselves, the parents want their own damn space.

sure, every parent in the world has this mindset

Of course not, but look at it this way, if you had to do everything for a kid for 18 or so years, you would want your own space again.