There is more than enough work for everyone right now, and (outside of recessions) we will not run out: https://en.wikipedia.org/wiki/Lump_of_labour_fallacy

As more and more work is automated, the lifestyle level increases rather than decreases. Automation lets you produce more with the same amount of labor, increasing productivity and raising the standard of living. This is the sole reason we're not subsistence farmers right now.

War does not help the masses; it is purely destructive and one of the worst things you can do for the economy in the long run.