Your point about biases aligning with the field is interesting. I think it depends on how "generalized" a field is. "Economics" for example, allows exploration of both pro-capitalist and anti-capitalist perspectives. However, social science has been subdivided into many narrow fields like "gender studies", which include presupposed assumptions. If instead these same subjects fell under a single broader field called "social science", then there is room for academic exploration both in favor of and against such assumptions.

We probably both agree that individual bias cannot realistically be eliminated. However, I feel that despite biases, individuals shouldn't practice disingenuous academic behavior. As a quick example of this, I'll offer that sociologists regularly claim there is a significant gender pay gap without performing a multivariate study that controls for various confounding factors. If they exercised more rigor and held a sincere mentality of truth seeking, they would explore those obvious contradictions to their assumptions more readily, and also welcome the same explorations from their students and peers.

I think intolerance for different opinions is broader than just professors though. It's also campus administrators (https://www.nytimes.com/2018/10/16/opinion/liberal-college-a...) and the students themselves (https://www.thecollegefix.com/shock-poll-most-students-oppos...). If this intolerance persists or worsens, the outcome will be that anyone who disagrees must self-censor and express blind faith to avoid negative consequences. That's not academic freedom, but rather religious coercion.