> What's even the point? Rich people staying in power is the point.
> Why not surrender? Surrendering is not always practicable. You will get killed if you're a liability to your captors.
> What am I protecting or preserving? That's really only yours, and yours alone, to consider.
There is another option too: cooperate.
Any ruler wants active units of production (humans extracting money or gold or food), and for that it has to bring some sort of stable life environment and not be too greedy so people don't try to revolt.
Whether you get such through political negotiation before or after a war, or through a vote, or through a revolution, is the same as the end.