It’s the initial post of this thread - the opening post.
You don’t know that at all, it’s likely that somebody who objects to the Church’s position on the subject sent the threat.
You can’t say it’s “gay activists” - well you can, obviously, but it would just be an unsubstantiated accusation without some evidence - or that the individual or ‘group’ are in any way representative of anything other than the individual or group. Otherwise it’s “somebody from a set ‘x’ did something therefore all of set ‘x’ are guilty”. Is the individual/group representative of the set or a subset of the set?
Are clinic bombers representative of the ‘set’ known as the pro-life movement or are they a subset of the pro-life movement not representative of the whole?