I don't think "dissent" is the word you're looking for here.
As far as I'm concerned, any dissent on any subject should be tolerated in a free society.
When you get to the details of how that dissent is expressed, then you have a discussion topic.
There's a big difference between a protest that marches down a street with signs and chants, and one where cars are set on fire and businesses broken into and torched.
I'm using the term "riot" to describe where I think such devices have a use.