I - a 32-year-old gay man - have some thoughts.
Admittedly, as a man, the issues gender identity causes do not affect me as I'm not the one affected by this (for example, I have no desire to ever set foot in a woman's bathroom, do not want to harm a woman or girl, and, sexually, have no romantic attraction to women or girls whatsoever, guys on gay dating sites etc who cross-dress I avoid because that does nothing for me, and I've never thought that I'm a woman, nor ever wanted to be one), so I apologise in advance if anything I've said here comes across as insensitive, contradictory or anything like that - I promise I'm not here to change anyone's minds, or to lecture anyone, but to learn from those this issue affects the most.
I don't know any trans people personally to my knowledge, nor of anyone who has ever suffered with their gender identity - again, to my knowledge. If ever that becomes the case, I would ultimately respect them and their preferred pronouns. I don't believe that every man who supports gender identity has an ulterior motive and wishes to harm women, nor do I think that all trans-identified men who use women's bathrooms want to harm women. I don't believe that 'woman' is a set of pre-conceived ideas, ideals and notions either, as every biological woman is different. But I'm slowly becoming aware that women cannot tell the difference between the trans-identified who wish to harm them, and those who don't.
I re-read JK Rowling's original manifesto, whatever you want to call it, that she wrote back in 2020, and one line keeps embedding itself in my head: "The current explosion of trans activism is urging a removal of almost all the robust systems through which candidates for sex reassignment were once required to pass." And I find that quite unsettling. Surely those 'robust systems' should remain in place, and any candidate for sex reassignment should undergo this over a number of years before being legally declared a woman, and GRCs should be issued only to those who have undergone sex reassignment surgery?
I'm ashamed to say that it's only now dawning on me that JKR was right all along - even if I vehemently disagree with the apparent mentality some have that Daniel Radcliffe, Rupert Grint and Emma Watson should show her blind loyalty and agree with everything she says/does because they starred in the movie adaptations of her books. All four people are fully-grown adults with minds of their own, capable of forming their own opinions.
Anyway, these are my (probably incoherent and contradictory) thoughts - but I promise I'm learning, and am open to any and all views/critique on this!