They care about them in a performative way. The minute it stands in their way or they can’t use it as a tool to get your support to gain or maintain power they will immediately drop the act.

Standing up for trans acceptance and rights is the right thing to do but it is by no means a winner of a political platform:

The public is divided over the extent to which our society has accepted people who are transgender: 38% say society has gone too far in accepting them, while a roughly equal share (36%) say society hasn’t gone far enough. About one-in-four say things have been about right. Underscoring the public’s ambivalence around these issues, even among those who see at least some discrimination against trans people, a majority (54%) say society has either gone too far or been about right in terms of acceptance.
https://www.pewresearch.org/social-trends/2022/06/28/americans-complex-views-on-gender-identity-and-transgender-issues/

Democrats haven’t dropped it yet, despite anti-trans sentiment being one of the Right’s favorite things to rally around.