My thought is that it is because 'self-ID as bad legislation' is not particularly about trans people. It is about women and children and men. The safety of women and children being threatened by some men.
It is therefore a mistake to attempt to conflate that issue with discussions about social acceptance of trans-people, or to seek to find answers to it by talking to trans people - as this article demonstrates.
Really, why would trans people, who are quite reasonably caught up with their own particular issues and campaigns, be the right people to talk to about an issue concerning women, children and men? It's not surprising that they want to talk about their issues, from their perspective and will use any moment in the media spotlight to do this.
It's a bit like asking feminists to talk about something like fuel tax - an issue that affects many people, including many women but that isn't particularly a feminist issue. (There will be a better analogy). In time, transwomen may come to think more about women's and children's safety from a woman's perspective but that's not where the campaigning end of their movement is right now and that is not surprising. So, for now, this strikes me a bit like all those derailing discussions that address feminists thus: 'but why aren't you concerned and campaigning about x, y, z issue, that is clearly far more important than ?'.
Of course there is an intersection between women's concerns about the dangers posed by self-ID, the interests of transpeople who want self-ID and the interests of transwomen whose safety may be compromised by self-ID. I know too that my separation between 'women, men and trans people' is a simplification and, that there are legitimate concerns about the baggage transwomen may bring with them from masculinity.
But my point is that concerns about self-ID are primarily women's concerns about bad legislation and are best addressed as such, by talking to women about abuse by men, and to former children about abuse by men. The extent to which they encompass a concern about transwomen and their masculine baggage is relatively small, compared to the far bigger concern about abusive men taking advantage of bad legislation.