No therapy is guaranteed to work. Many male sufferers refuse to get help and choose to self-medicate with drugs or alcohol. They may turn just to talking with peers which has not been shown to be that effective.
However, the cognitive behavioral and eclectic therapies have a good track record. In classes, I have seen for real Special Forces guys tell the males that they should note the symptoms and seek help as it can work.
There is resistance in that getting help is seen as not being manly or that if still in the service or being an LEO, the choice to get therapy will hurt their career. There may be some validity to that.
Absolutely agree with you here.
n any case, stress disorders can be helped. The idea that if you don't intervene in a situation you will be psychologically ruined for life is not a truism. If you don't try to get legit help, it's on the person.
Most folks actually do understand themselves pretty well; of course it's not a truism that non-intervention will psychologically ruin one for life, but I'm not going to call BS on someone who believes that if they could take some type of action in a crisis, but didn't, would then have trouble afterwards living with themself... well, every person is has differing existential responses to life events.
I also note that in simulated bystander intervention FOF, the classic male beating a women, about half of the very skilled, selected participants did not intervene for the reason of protecting themselves from immediate harm and/or later consequences. Can't say where this was because it was proprietorial, sorry.
Many, many factors at play here. One can easily understand why the average citizen would be hesitant to intervene in a situation not involving themselves or one of their own family members. But over the recent few years, I've personally witnessed professionals in law enforcement who are reluctant to intervene in situations, a couple of which were even very clear cut, with serious bodily injury to others occurring. Pretty sure most here can hazard a guess or two why this is happening.
In line with the thread topic, myself and a couple other instructors liked to end some of our range training sessions with a little competition, "Would you take the shot?" Have the officers do ten burpees or run full speed -- at least 50 yards -- up to a firing line -- starting at 25 yards, then 35, then 50, then longer until the last guy (or gal) missed a single head shot (on a bad guy target). With pistols.
Here's one of our local guys who ended a armed bad guy's rampage
with a pistol shot from between 80 - 84 yards.
https://www.thefreelibrary.com/Killer+at+a+distance:+the+Scott+Bramhall+incident.-a0478139936
My point would be, if you carry a firearm in your community, be prepared for any situation -- and practice for any type of situation. Even if your plan A is to egress the danger zone as fast as you can. As a citizen, even if you never need what you'd learn from it; force-on-force (FoF) training is the closest you may come to feeling what a real-life situation can be like, moreover, the training can be enlightening (as well as fun).