I think this probably the case as well. If I look back at how my own views shifted, the shift very likely would’ve happened regardless of if I’d attended university, assuming everything else was the same. It wasn’t the university that resulted in the shift as much as it was my getting out of my local bubble out into the world and experiencing it for myself.
Basically any kind of life experience that brings a young person to actually think and more deeply consider the world around them is likely to result in some level of individuation and shift away from inherited views. It’s perfectly natural and healthy.
I don't think you're wrong about the axes for "academic intelligence" or "political outlook". But those are just two of many. Geographic, racial, economic, class (in the European sense), language, culture .. these are all equally valid, and likely to vary more in a university than in a workplace (even in the military).
That seems to be missing the elephant in the room - they sent kids in their most formative intellectual years to immerse themselves in a culture where there is a very high child:adult ratio. Then the kids come back with this wild culture that would make a lot of sense to a bunch of teenagers and young adults. It isn't just that the kids individuating, it is dumping them into one of the most elitist, authoritarian and artificial subcultures society maintains - populated mostly by near-juveniles I repeat - giving them independence to form themselves and discovering that dislocates them from their parents subculture.
It should be obvious that will happen but parents tend to be pretty dumb. No real training course for parenting I suppose.
In reality I don’t think people’s political opinions change very much and they are just mad that their children individuated.