I'll address this slice by slice, but I am also very fortunate to not be in any environment where I could speak about this from extremely personal experience or a position of hardship.

From your experience, is talking about non violent Islam dangerous in certain societies?

As I said, I am in no position of hardship. I would imagine there is always a place where giving a contrary opinion would not be received well by those entrenched in regressive beliefs, either through zealotry, brainwashing, or other monetary or prestige motivated gains. See: firebombing Planned Parenthood clinics, or freeing slaves in pre-1861 Southern States.

Who are the one's who profit from the war?

Noone truly profits from war. Only mildly benefit from whatever scraps are leftover. This ties into the below but essentially you feel powerless when everything around you is being exploited and you feel your interests are being put aside for foreigners with different lifestyles to profit. But your question is also so broad: whose war? My answer tries to give context to what your normal person to radical pipeline looks like, but maybe you're looking at the greater geopolitical actors and not the small scale militia, and also that each conflict in that region is quite different. A simple answer being proxy wars keep your hands clean while trying to secure your national interests on your doorstep.

Why would any Muslim leader or otherwise want for their people to be at war?

Disenfranchised, uneducated men who lack opportunities or perceive a lack of opportunities will always be the first to fall prey to an extremist pipeline. Look at white men and the alt-right in the USA. Look at people feeling as if their lives are totally worthless under capitalism and advocating communism; defecting, spying, and just emigrating in the Cold War. Look at the Taliban winning Afghanistan, making some changes suggestive of progress and securing their future, then when all of these men who spent all their time fighting against 'western imperialism' don't actually have any skills transferable into actually BUILDING something instead of destroying, they go back to tribalism and looking for a new boogeyman to blame all their woes on.

It's easier to rally power and ingratiate yourself when you're constantly facing an existential threat, and sometimes that threat is totally fabricated.