I think you’re confusing rationality for plain self-interest. If you have something to protect, then it may be reasonable to sacrifice personal comfort or even your life to protect it.
Also, you comment implies that the only reason you’d fight for something other than yourself is out of “liking the idea of yourself as some sort of social justice warrior,” as opposed to caring about something and believing you can win by applying some strategy. And saying you’d “ruin your life” implies a set of values by which a life would count as “ruined.”
I think you’re confusing rationality for plain self-interest. If you have something to protect, then it may be reasonable to sacrifice personal comfort or even your life to protect it.
Also, you comment implies that the only reason you’d fight for something other than yourself is out of “liking the idea of yourself as some sort of social justice warrior,” as opposed to caring about something and believing you can win by applying some strategy. And saying you’d “ruin your life” implies a set of values by which a life would count as “ruined.”