How do you determine what does and doesn’t affect other people? At some level, everything anyone does affects everyone they interact with. You and I are affect

How do you determine what does and doesn’t affect other people? At some level, everything anyone does affects everyone they interact with. You and I are affecting each other right now, in some small way. It seems like what lots of people do is say, “some of these causal effects are unimportant to me, and so I can approximate them as being zero.”