And here's what happened when the British Government admitted that its secret services, the Army and the police organised the murder of solicitor Pat Finucane by gunmen in their employ, then covered it up afterwards.
OK, this is an illustrative picture rather than reportage, because it's hard to find a picture of people not rioting but remaining dignified in response to state-sanctioned murder. But the difference between the two groups' actions is instructive. I don't think the individuals involved are any more or less civilised for coming from one or the other communities in the six counties: but clearly a subgroup of one is prepared to meet democratic change with violence whereas the other has committed to peace in the face of the most outrageous provocation.
What was really disappointing was the Progressive Unionist Party's approach. They're the political wing of a loyalist armed organisation but – like the Official IRA in the 1970s – seemed to be developing a socialist class analysis of the situation. But over the past few days they've been calling for 'Protestant unity': further entrenching the sectarian divide at the expense of proper progressive politics.