The soul could be considered more important, as it was created first. Also, the soul gives the body life. The soul is divine, whereas the body is physical
Based on Darwin's theory of evolution, human nature is all about survival of the fittest so in order to survive we need to be selfish. Therefore, it is simply human nature
If we have freewill then we should be punished for doing evil. If we don't have freewill and everything is predetermined then we should not be punished for doing evil