I am not even going to pretend to be knowledgeable on any of this- I just know what is behind my families decision and a few other close friends’ decision (and surprise- we have similar view points - 
)
But my uneducated opinion:
Those that are moving south for school are not considering politics (or at least not a major part of the decision) but those that are choosing not to- are considering politics. 
Many of these southern schools are doing a fantastic job with marketing and enticing $$$ offers. I can see the draw that many have for these excellent universities!! (and there are many great options)
But for our family- there are just reasons that they will not work for us.
But I have never even thought negative things towards those that are going there- I am excited for anyone who has found what feels to be their ‘home’ for the university experience (and I hope that is how most also feel?!).