Surely there are women’s issues that affect a larger part of society.
It's hard to think of a more basic issue than the one that tries to declassify 50+% of the population, Elizabethbd .
As other posters have said, if you can't define yourself as a woman, or define what a woman is, you can't campaign for women's rights.
I tend to stick to the simple core point: it is impossible for humans to change sex, so transgenderism is founded on something that is incorrect.
That's not anti-trans, that's pro-fact.
It doesn't matter how many trans men or women you actually come in contact with - it's a matter of fact, not of personalities.
Even if trans rights did not impinge on women's rights - which they clearly do - that wouldn't change the basic point that human sex is binary and immutable, so transgenderism is based on a mistaken concept.
That doesn't mean that trans people don't exist, or that we should hate them - people who believe that the earth is flat exist, and I don't hate them, and they should have all the human rights that any other human is entitled to.
But they are factually incorrect, and if they started campaigning to have things like language or the legal system changed to assert that the earth is flat, or to have school curricula changed so children were taught that the earth is flat and not an oblate spheroid, they'd be resisted as energetically as trans ideology is.
I hope that helps you understand 'why this is such an important question to many women.'
I'm not from the UK either, and when I see the courage of women in the UK who are taking a principled stand on this subject, I wish we had the same level of pro-women activism in my country - yours too, perhaps?