We can accept transgender because we know that, after having transitioned, they cannot fake their feeling and gender identity to sexually harass people of different sex.

I also want to push back against this because the data in pretty much every country in the world will prove that the men who want to sexually harass anyone do not go through a charade of cartoonish proportions just to be able to do it- they just do it. A man will not think about disguises so ingenious and clever that no one would be able to tell he's not a woman just so he can go into the women's bathroom- he just goes into the women's bathroom. I don't know where this notion comes from but it's incorrect and, like many things, likely just plays to cisgender heterosexual insecurities.