They want any LGBT person or supporter who makes a threat of violence arrested? Correct? For an example there was Sarah Jane Barker who made a "if you see a TERF, punch 'em in the face!" comment. There was a Glasgow protest where someone held up a cardboard sign with a guillotine crudely drawn with a crayon and "decapacitate TERFs" or something scrawled. These happened years ago and to this day the GC community still talk about and refer to them and say they should have been arrested/charged/convicted.
For another example a trans person a while back jokingly posted something like "let's give KJK a NZ welcome" on twitter which then led to a lot of angry GC people from here making police reports and brigading them (someone posted a link on here and lots went over to be abusive directly to her).
And then Graham Linehan threatens to/incites others to punch trans people in their genitalia (not his first time btw, he has a long track record of threatening and inciting abuse and violence towards LGBT people and their supporters), and yet these same GC people flock to twitter to say that it's "free speech" and "people shouldn't be arrested for online communications".
So what is it to be? If you want LGBT people arrested and charged for threats then GL would need charged too.
If you want GL to have a "legal pass" to make threats then that means it should be the same for all including LGBT people and allies.
Whatever the law is it needs to apply to everyone equally. You can't have one rule for GCs and another rule for LGBT people and allies.