Can an ideal be achieved? If my understanding of what ideals are is correct (i.e., a mental conception regarded as a standard of perfection), then it seems that they are, by their very nature, unattainable (at least in a corporeal sense). Yet, nations are built, wars are fought, and people are killed over ideals. If they are only "perfect ideas", doesn't that seem a bit absurd and irrational?
Is my understanding of what an "ideal" is incorrect?