[sp332]

It's not the strongest kind of proof, but it's still evidence. https://en.wikipedia.org/wiki/Inductive_reasoning

I think we literally mean different things by the word "bias". It doesn't have to be intentional.

Even if somehow the population they were drawing from was 99.6% male, I would not comfortable with conference organizers who just passively accept that. At best, they're still perpetuating other people's discrimination. I think the fact they didn't even care to address that is what made these speakers uncomfortable enough to leave.