Hardly tenuous considering the scale of the protest, but anyway, it wasn’t a police action. According to Reuters it was British Immigration Officials who detained the two men on ‘suspicion’ and Scottish police who later released them, so however you look at it, the action by the Home Office was unnecessary and provocative.
On another issue I have to ask about your ‘dickhead trade unionist’ comment. As someone who was a trade union activist until quite recently, does my past activity also make me a dickhead?