This is a brilliant piece by Gavin Haynes, tied to a radio programme, about the concept of "purity spirals" - the idea that's taken hold in certain groups that you have to continually demonstrate your ethical credentials. The example he gives is anti-racism in the knitting world, but obviously it can apply equally trans activism. Anyone who isn't 100% pure is regarded as morally beyond the pale. He makes historical analogies with Maoism, amongst other things. Fascinating - and spot on.
unherd.com/2020/01/cast-out-how-knitting-fell-into-a-purity-spiral/