I will answer "why not" even if it might be rhetorical. Because there is no sharing between light and darkness. All those who do not choose life are in darkness. Life will be just like we have now. And it isn't good for most people according to what I know about poverty, bias, discrimination, dogmatism, fanaticism, injustice, narrow-mindedness, partiality, provincialism, racism, sectarianism, sexism, unfairness.
People have been known to have a change of heart in a single lifetime. What is difficult to believe about having an eternity to as well?