I know, as a PR hack, that a significant portion of the work I do is complete and utter bullshit that doesn't benefit society. So when I get an email from a principal saying the stuff I wrote for them is genuinely helping them communicate a decision to parents, I get a nice buzz of pride and accomplishment.
This is also why I can't really imagine doing this job in the private industry. I feel like I'd just be trying to convince people that decisions that put people over profit are good.