Well, the big problem with shooting myself is that it's temporary. If it would permanently solve both problems, then it would be the obvious choice.
As stated, it seems that I can save lives from hunger, forever, but that those lives will then be lost to war, or I can permanently save lives from war that will then be lost to hunger. Without clear guidance there as to how powerful each would get with the other's demise, it seems like all you're asking me between those choices is whether to starve or shoot more people, and to be honest neither apeals. Yes, the changes last forever, but they make no net difference, if you follow me.
Therefore, it seems like the only way to relieve any suffering at all, rather than just transmuting it from one form to another, would be to take the temporary deal at the cost of my own life. A hundred years really isn't a long time, though, in the grand scheme of things... this would likely be my choice, as it's the only one that seems to help anybody, but unless I'm Gluttonous Hitler I would want some assurances as to why that would work, or why it makes any kind of sense.
