Datun, your letter sounds excellent. The inclusion of links so that politicians can inform themselves about what trans activism and trans ideology actually involves is a good idea.
I'm Australian and we have similar legislation being proposed in our state parliament. I am writing a letter to my MP which keeps the focus on debunking gender identity ideology. I think it is very important to make a distinction between 'gender identity' (the belief that the state of being male or female is a 'feeling' rather than a biological reality) and transsexualism (a medical condition in which a person feels deeply distressed about their sexed body and wishes to change it to resemble that of the opposite sex).
IMO, that is what is doing all the harm - the determination of trans activists to impose their ontology of gender across all of society. We must keep emphasising this: this is not about attacking people's right to live as transsexuals, it is about challenging an ideology that looks progressive on the surface but is actually anti-woman, anti-gay and anti-science. In this instance, the current legislation enshrining the right to self-declared 'gender identity' would effectively eliminate all sex-based protections for women, given that gender identity will now override sex in determining who is a man or a woman.
Transsexual people have the right to live their lives without discrimination or harm, but they do not have the right to force everyone to adopt gender identity ideology. This ideology is not only repressive (in that it forces everyone to go along with an evidence-free belief system) and regressive (in that it reinforces and amplifies sex roles), it is causing real material harm to women and children.
We need better legislation than one that wrenches the categories of 'man' and 'woman' free from any objective criteria. It is possible to legislate to balance the rights of transsexuals with those of women and children, and politicians need to urgently come up with ways to do so. This necessarily involves rejecting outright the absurd proposition that a woman (or a man) is anyone who claims to be a woman, and therefore rejecting self-declaration as the only criteria for legal change of gender. Otherwise politicians are walking us all into an Orwellian future in which the material reality of sex difference - and the myriad ways this impacts women - will become impossible to describe, let alone form policy around.
Speaking of the future, the mutilation, sterilisation and use of untested drugs on the bodies of sex-role non-conforming children is going to be a huge scandal in the coming years - it might not hurt to remind MPs of this, too. FYI for anyone who needs them here are some links on what the shockingly irresponsible, and rapidly expanding, paediatric transition industry is doing to children:
4thwavenow.com/2017/01/26/shriveled-raisins-the-bitter-harvest-of-affirmative-care/
4thwavenow.com/2017/01/20/gendercare-london-private-clinic-with-a-winning-business-model/
www.transgendertrend.com/gender-identity-rights-of-the-child/
youthtranscriticalprofessionals.org/2016/10/23/questioning-academic/
All of this will probably end up in my letter, other posters should feel free to use or adapt any of it if they like.