Because it doesn't actually achieve anything. It is just typical brain dead male logic. How does burning down the homes of your neighbours help your cause.
Nor does "having a go" at the police achieve anything.
More interestingly is why do men riot.
9 times out of 10, it is no different from those who go to football matches with the intention of getting drunk and picking a fight.
We should protest to the media and say stop calling male hooliganism "rioting".
It isn't it is just a mass expression of men who think violence will win their point, assuming they even have one.
A riot as a political act is more likely to be when a political protest or march is suppressed by which ever regime the protest is being held against.
However I think in France (and maybe Italy) riots have a rather different history.
Not sure the UK has had a "riot" since the campaign against the poll tax.
Not always acknowledged, or encouraged, is the role women have played in resolving conflict. eg the Northern Ireland Women's Coalition, and of course Mo Moland.
Perhaps not surprisingly as it is more likely than not that women have helped build communities.