SJWs are just foot soldiers anyway. The real power is veiled and hidden. The rot of our society goes much deeper, and the Left merely capitalizes on and reinforces it.
I would say the problem is less Leftist professors or vertically directed propaganda, though that is a problem, and more social pressure.
Why do people support BLM? Why they do they support Antifa? Most people aren’t deep thinkers or do research for themselves.
They rely on their peers. What the left has done successfully-is manage the social and cultural consensus. It doesn’t cost anything to think or believe “Trump is Hitler” or “being a transgender is like so hip”. Their peers think these things, or people believe their peers do, and they go along.
They manage the culture, through the management of the norms. This means the baseline is generally in line with what they want.
Social engineering and mass compliance, means that professorial or direct indoctrination is simply a matter of reinforcing trends and beliefs already existing.