It's not about profiting, it's about what your community needs. If you are one of "all those people won't just keel over and die" (as the grandparent post stat

It's not about profiting, it's about what your community needs. If you are one of "all those people won't just keel over and die" (as the grandparent post states), then your community will need arms to, well, not just keel over and die. The same applies for any community that might get overrun by their neighbours - if global warming is going to bring on resource conflicts, if you refuse to be prepared and armed as a deterrant, then you will be inviting violence to your home as you will be an attractive victim. Sic pace, para bellum is an ancient principle that's relevant whenever a contest for resources becomes meaningful; so the point in investing in arms companies is not about profit, but about ensuring that your community suffers less in the coming turndown; you and your community will not get a "fair share" of dwindling resources just by existing (that's hard enough even in times of plenty with less motivation to compete for basic resources), it will get only as much as its strength allows.