Sorry, I should have worded that more clearly: Only that science or truth that is doesn't contravene the current social order is allowed air, allowed to be talked about without reprisal and shunning. The degree to which this is true is a canary for how totalitarian and neurotic your micro-society is. The micro-society of universities generally seems to be becoming more, rather than less, rabid and paranoid.
A lot of it is like Bostrom's idea of the decentralized electroshock dystopia: even though a significant proportion of people are witches, everyone's afraid of reprisal for not actively hunting witches, so the witches-in-hiding hunt their own when they're unmasked.
But this is the way of things; this wave will pass, eventually, as well. And like the soviet scientists who kept their heads down and mouthed the party line, the secret iconoclasts will survive till the current order is replaced by the next, with its own peculiar tabboos.
