I have a theory that the highest priority most people with wealth (very reasonably) have is "never be financially insecure again" (propagated to their descendants), and that the more wealth somebody has beyond "sustain a comfortable lifestyle indefinitely off of dividends", the more of their money and mindspace they invest into protecting themselves against the long tail of circumstances that could affect that. Applied on a broad scale, with different value systems and mindsets, this explains both preppers ("Society might collapse, so I should do everything I can to ensure that my needs are met in that circumstance" with a little bit of "here's hoping it happens so I have an excuse to shoot someone" mixed in) and philanthropists ("Society might collapse, or even just fall apart to an extent that degrades my control over the means of production, so I should do as much as possible to keep that from happening").

At the extreme of wealth, an appropriately diversified portfolio takes both options into account. If you have $1 Billion and think there's a .1% chance that society will collapse soon and make your money worthless, you're perfectly justified in spending up to $1million to protect against that contingency.