US soldiers fight and die in wars so that Mormons can convert people in the new lands.
Many Mormons say that the wars America fights are worth it because it opens these countries up to missionaries. They hold up Japan and Germany as examples of countries that we invaded and then sent missionaries to.
It is very common for Mormons to justify the Iraq and Afghanistan wars because they claim that this is paving the way for Mormon wards and branches to be established in the Middle East. Some Mormons even predict war with China and Iran in order to open those countries up for Mormon missionaries.
So that is why America fights wars! To make more Mormons.
By: Captain Moroni