Today's world is full of corruption, evils, sadness, and hopelessness.

For a lot of people, an apocalypse is like a new beginning. A chance to make their mark on society (or what's left of it) and rise to the top.
For other people, it's a release. Maybe people were tired of the world, and the apocalypse is their excuse to be released from the world.
Either way, for a lot of people it will be an opporitunity.