This isn't about justification. Anybody can feel justified to do whatever it is they do according to their own personal code.
I can't tell him that he can't feel justified in doing whatever it is he does according to his own code.
My point is about what makes sense? If I have a problem in front of me, and I drew up 10 different battle plans to solve it, these plans aren't all equally good/effective. For the circumstances, self-immolation couldn't of been the most effective plan.
Martyrdom could have been a route, but not like this.
I think martyrdom is heavily tied to religion for a reason. Can there be a secular motivation to do it? Sure, but I'm evaluating the specific act and circumstances, not just the sacrifice. An atheist could give their life to save someone else out of love, and everyone would understand that.
But giving your life in the hopes that it gets enough attention to stop a bigger event on the other side of the world is frankly not rational and borderline narcissistic, despite the well meaning intentions. You can be pure and an idiot at the same time.