"I mean I could have been an undercover policeman or something..."
If the police wanted to bust people hypothetically threatening other people with violence, they just have to look on social media a bit. But as far as I know, a vague hypothetical threat like this, would probably be dismissed by a court. I rather know, that there are many people walking freely around who do make not cague, but concrete threats to concrete people and the police usually says, they cannot do anything.
UK police has a multiple decades long history of infiltration of animal rights groups, though. They likely wouldn't try to act on a non-specific threat like that, because you're right it probably would get dismissed, but it's the kind of thing that certainly could trigger unwanted attention.
If the police wanted to bust people hypothetically threatening other people with violence, they just have to look on social media a bit. But as far as I know, a vague hypothetical threat like this, would probably be dismissed by a court. I rather know, that there are many people walking freely around who do make not cague, but concrete threats to concrete people and the police usually says, they cannot do anything.