The overall goal is to procreate and promote the species. To survive, at its most basic.
My goal is to enjoy every day that God gives me, no matter what s/he may dish out.
As far as art and weapons/war, death clears out the way for the newer, the stronger, to thrive. When one has served its purpose, it needs to die in order for the procreated to thrive. Otherwise, the whole system would get gummed up with geriatrics. Weapons just hasten death, and hence progression. War clears out thousands of the weaker, and provides that much more resource for the stronger to use so that they can procreate the better species. Every species wages war in one form or fashion and at some level; simply competing for scarce resources is war. War is part of life, it is the struggle. If the purpose of art is to imitate life, then art should paint war, just as it should paint rest, butterflies, and unicorns.