We are caught in an inescapable network of mutuality, tied in a single garment of destiny. Whatever affects one directly, affects all indirectly.
Distribute your attention and effort as a function of how effective your effort can be. How meaningful is my indirect effect? That's often a function of how many nodes are between you and the thing on the big whopping graph of interconnectedness, but not every time.
Figuring out your allocations is a lifelong optimization process. Sometimes it is extremely obvious, usually it's not.