You're ignoring the fact that investment has been plainly beneficial everywhere in the south. From land grant universities and TVA electrification to NASA in Huntsville and St Jude in Memphis, it's pretty clear that southerners don't just choose to "leave themselves behind" when given resources.
My comment was an observation of a cultural difference that is not even really confined to the south. It’s more about rural and urban differences. I can only speak about the south because it is what I have experienced.
A culture that is at its root regressive, anti-science and anti-intellectual should not be surprised when it does not succeed in a modern world.
So, as much fun as it is to blame these people for their own woes it is neither productive nor accurate.
When I was a midwestern public school kid of the 70s and 80s, Kansas was on par with the rest of the midwest in terms of general public education. After Brownback and his ilk have finished raping the state anyone with a child under the age of 14 should probably consider moving to a another state for the sake of their own child's future. This is not a problem that goes back generations, and the cause and solution are blatantly obvious.
Seriously, the one word response to your attempt to absolve them of any agency or responsibility for this situation is "Kansas."
We can accept it’s a crappy cycle that won’t change without external inputs or we can mock them to make ourselves feel better.
But that's just gut feeling.