Humans are a communal species, our cultures and psychology include behaviour that sacrifices our own personal reproductive chances in favour of the survival of the group, or simply deprecates personal reproduction as a priority. It’s genetic propagation by proxy, and it’s called kin selection or genetic altruism in the literature. A member of society can contribute to the survival and propagation of that society in many ways, propagating the group genome, and that doesn’t have to include through personal reproduction.
We have all benefited from the contributions made by members of past generations that didn’t reproduce, but their genes live on through their relatives that did reproduce. If all we care about is survival of the species, the best thing for all of us is that trans people get the help and support they need to leave the healthiest and most fulfilling lives possible, so that they can maximally contribute to society. I think that’s an overly reductive attitude, but that’s one way of thinking about it.