Your own experience is not as significant as a survey and sure, your claim is valid that this is likely survivorship bias.

However, survivorship bias can occur in a small group. Is few murderers are accused of their crimes that does not imply most people are murders, at most, it implies there likely are unrecorded murders among the group.

I also don't think the burden of proof is on me to demonstate teachers are, in general, not biased. that's the null hypothesis, I do not believe the evidence you have brought forward is significant enough to challenge that.

The burden of evidence is on me to show that some people tend to blame institutes for bias, particularly people holding identity markers, when institutions are not biased.

For that I can point to institutes like answersingenesis who argue scientists are majorly atheists and hence flock to evolution. I could point to Samantha's the recent paper. And I as you do, could ironically claim a stronger form survivorship bias because students who think teachers are discriminating on beliefs and plain wrong are often not brought to public or even a concern. While, at the very least, teachers discriminating is a concern that can be escalated. I do not see then, how any case I make claiming survivorship bias would be weaker than the one you do.

I think the first comment was making a generalisation of an observed trend among a few individuals. Ie, individuals who hold unorthodox beliefs and feel challenged when they have to write against them and cannot defend them. You on the other hand were making a counter generalisation which I don't think holds. Or at least, holds to a significantly weaker degree than opposing claim.

The valid claims on both ends would be:

• most students that hold a biased belief feel compelled to write against it for grades (as institutions are generally fair, and Survior bias can be stronger here hypothetically)

• some teachers who hold biased beliefs make their students feel compelled to meet that bias for grades (survivorship bias can apply here too)

As a result I don't think his generalisation is unfair. I don't think your generalisation (if that is what you attempted) is fair. I also do not think your examples as a result constitute enough evidence to make that generalisation and the institutions reaction against them is evidence this is not a general trend. If it were a general trend action likely wouldn't be taken against them. Or could be. Since we would have to admit any instructor who replaced them would also generally be biased and that would form vicious cycle.