The idea behind fanatical transgenderism is that reality is socially constructed, so denying Bruce Jenner is a woman is the same as annihilating the woman Caitlyn Jenner. It’s equivalent to murder, and implicitly to genocide.
But why do respectable people repeat this stuff, which you’d think they know is insane?
For some it has a bit of a potlatch quality. Reckless extravagance proves invulnerable status.
For others it’s a direct exercise of collective power – this is so because we say it’s so.
And others would rather feel hate, contempt, and aggression than fear and humiliation. So if they have to mouth stupid lies they make them their own and force them on others. That, it may be, is why progressives have become so horrible.