system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer 40,000] Are there non-Chaos insurgencies?

Apparently, all uprisings and subversions we hear of in mainstream material are somehow related to Chaos worship. This is sort of surprising, there's so many concerns people could have that wouldn't make you look at Chaos worship as a solution (in fact, Chaos only very rarely seems a plausible thing to worship).

Are there ever any uprisings or subversions for entirely mundane reasons or ideologies? Are there communist uprisings on Industrial Worlds? Peasant revolts on Feudal Worlds? How about some backwater planetary governors declaring independence for non-Chaotic reasons of personal ambition or because of not wanting to sacrifice their son or daughter to the Black Ships?

How about insurgencies that follow religions that have nothing to do with Chaos? Is there an Islamic State in some system? Is a future version of Al Qaida sitting on some desert planet, plotting to bomb the Imperial Palace?

If not, why no?
gpt
I do believe the Siege of Vraks began as more of a political scuffle, a religious figurehead seeking to accumulate power before trying some sort of shenanigans. Chaos filtered in slowly there.

An important thing to consider, lots of Insurgents may not openly understand they're using Chaos at all, it is kept secret from the population. Also, many of them may start out as secessionists or revolutionaries, but when times get desperate.. well, you take help where you find it.