https://www.washingtonpost.com/news/morning-mix/wp/2014/08/1...
(Of course we can discuss if most of the uses of tear gas are wrong, but lets for a moment think that we have a moment were we need to chase away a crowd of evil persons riotong and threatening to kill perfectly innocent children.)
(Or at least use excessive force without regard for the presence of children: https://www.cbsnews.com/news/report-georgia-cops-critically-... )
The answer to your reframing seems likely to be that tear gas is better than rubber bullets, and that some sort of violence would be needed in order to stop the initial persistent violence.
Something else that's key, IMO, to the underlying situation is the rule of law; that those at any political level committing crimes need swift, visible, justice to demonstrate democracy is being adhered to. It should be much harder for a person in a position of power to avoid a prosecution and loss of power ... the ease with which that is happening for some at the highest echelons of power, to me, shows that the system is corrupt and demonstrates that justice will not be delivered for us plebs. Why then submit to that system, when those in power do not.