Right, but most people would still look at the effect of their actions on other people, even if indirectly.

Same reason I always rate customer service reps a 5 (unless something really appalling happened). Most companies would prefer you not provide feedback at all than provide a lower 5 rating on a 1-5 scale.

Sure, you don't have any responsibility to understand what is going to happen with the ratings, but once you do, it seems overly punitive to give low ratings.