Just what exactly is political dissent? Political dissent can come in various forms. People protest a current political system and still think it is advantageous to use it.
Other forms of political dissent may include protesting a political system entirely by advocating its abolishment. Politics etymology can mean many blood suckers. While I no longer participate in politics, I do endorse some form of political dissent.
However, watching any average protest, a person might quickly conclude that sometimes unexplainable events occur. For one thing police seem easily agitated and if a protest is large enough, almost always police threaten arrest if peaceful assemblies are not ended. It is almost as if this is some kind of turf war for police and they resort to war like tactics.
Another theme I have noticed with some larger protests is that out of seemingly no where violence erupts. A lot of times freedom fighters, anarchists, etc. are blamed. Well if you dig deeper, often times it is actual under cover police officers that instigate first bouts of violent behavior.
This leads me to my point that I think it is quite possible that most political dissent is steered by controlled opposition agents. Other labels for controlled opposition include cointelpro, emissary, spook, etc. Unfortunately, I think a lot of political dissent is controlled by outside sources.
Many groups you think are legitimate are often just preconceived controlled opposition organizations. There are countless secret societies, non governmental organizations, think tanks, political groups, philanthropy outfits, etc. that to me are just more group thinking controlled opposition. My premise is that established establishment lunatics know there will be dissent politically to a current oppressively corrupt system.
Therefore, they plan and prepare for any protesting and outrage by some citizenry. Things can escalate to a point that individuals get arrested and even charged, prosecuted, and sentenced in a corrupt legal system on trumped up charges. Political dissent is perhaps necessary in a current out of control oppressive system, but from my view point it can be dangerous at times.