Sera isn't looking for world change, she's just punching down the guys who abuse their power, which is admirable, but it costs her nothing to do so.
She, with no metaphor involved, risks her life for this stuff but you still say it costs her nothing. So unless
she actually dies for the little guy she's being selfish? That's setting the bar pretty high. What
should it cost her, other than her time, energy, commitment and, perhaps, life? Sera doesn't appear to
have anything in the material sense. "Sera was never quite the wealthiest girl - Some say she lives in a tavern."
she doesn't have to worry about the aftermath of her actions.
No, she doesn't have to but she does anyway. This is one of the things we
know about Sera.
All she has to do is fill the offending party full of arrows, which makes her incredibly happy in her own personal desires, and it seems that it's a bonus that it helped someone out.
Let me get this straight... you are saying that what Sera really likes is shooting people with arrows and that if someone is helped that's a happy little bonus? You realize that that directly contradicts what we, the players, are
told about Sera, right? We know exactly what she approves of, we know exactly what she doesn't approve of. We know, as well, that she is not some sort of sociopath filling people full of arrows more or less at random just because it gives her a giggle.