You seem not to have understood. Not a single poster on this thread (or anywhere on this part of Mumsnet) has said that all trans people are a threat. Trans activists, most of whom are not actually trans, are a different story.
You clearly don’t think that there are activists out there who will harass and punish the sisters now that their views have been revealed.
If you believed it was the case, would you think it was wrong?
And what would you need to be shown to be persuaded that it is true?