My problem with all of this is that I don't necessarily consider death a 'bad' thing, nor do I see living as the 'ideal' solution for all of the people suffering. I don't know what happens when we die, nor do I know if anything happens.
The only thing I subjectively know is what living is. I'd rather not end my life for the cause of something. If I happen to die because I'm fighting for something, well then great. Martyrdom is not a choice a person can make. It's not, yeah I'll be a martyr, or no I won't. Martyrdom comes from situations beyond our choices.
I'd rather live and help people through life (which will come to an end for everyone), and help them through what they're living through. If I can cure cancer by living and fighting, well that's awesome. If I can only make one person smile through my living and fighting, that's just as good to me.
I can't choose to die for these causes, because that puts a value on human life. I would be valuing all of those people above myself. Do I think I'm as important as everyone else? No. But I also don't see my life as having any less worth.
If I die for a billion, there are still seven billion I haven't died for. To me, there is no value to human life, and we all have the right to continue on living...including myself.