That doesn't really make much sense. Why should it matter if the identity is immutable or not? What matters is whether or not it is a useful way to talk about a

That doesn't really make much sense. Why should it matter if the identity is immutable or not? What matters is whether or not it is a useful way to talk about an issue and people. It's immutable that a kid is a kid. It's immutable that some kids have cancer. What's so wrong to use identity politics to say we should help kids that have cancer?