>>17913626 (OP)
>Why are random sahelian nations so affected by durka durka jihad?
Start with reading about the Algerian Civil War in the 1990s. Algeria became independent from France in the 1960s and was ruled by an authoritarian and militaristic party called the FLN (still is) which had its roots in a sort of left-wing nationalism:
https://youtu.be/OerXQjqWwh4
Then in the 1990s, there were moves to open things up, and the main opposition that rose up were Islamists who were inspired by waves of this coming out of the Middle East. Obviously there were problems with corruption and the economy, but the Islamists also appealed to the rural folks (and many people had moved to the cities over the years) with their highly socially conservative agenda. The situation radicalized and turned into a civil war because they couldn't agree to share power.
The FLN won though. It's a similar story in the Sahel except these countries are more ethnically divided and there are different tribes, and Islamism is not an ethnic ideology (religion can act like ethnicity but Islam is a univeralist religion) and the sense of nationalism is weaker in these countries than it is in Algeria. The FLN really had a nationalist origin story they could draw on. There are couple of other things I'll mention.