He could have said don’t go in the capital. Stay outside protesting all night if you want. That would have been effective.
The comments of those who don't know the proper use of common English words can be dismissed.
And when he told people to be peaceful, he could have said “And I really, really mean it”. But I’m not sure even that would have deterred the insiders and undercover rabble rousers who were responsible for what unfolded.