That a suicide bomber apparently associates himself/herself with the demonstrators is not a good sign, but that nobody was killed suggests it was a depression suicide with a message.

In any case, during the Islamic revolution there was no compunction against killing anyone who stood in the way. The same people are still in control and without civil war, and the same lack of civility on the part of the opposition the Mullahs will win and will have to become more repressive. I saw an article recently detailing how essentially all the government is now controlled by “ex” Revolutionary Guard officers. If it was not a true dictatorship before this, I predict it will be now.