Why would one pursue "a truly selfless view of the world"? We don't do things we don't get benefits from. We do things to feel good about ourselves, to witness (even if only in our imagination) another's pleasure (because it pleases us to do so), or just because we want to (and we're satisfying a desire).
Can you do something other than what you perceive as the "best" choice available to you? You get to define best and you get to make the choice. Give me an example of someone choosing something other than what they regarded as best at the moment of making the choice.
Here's a Slate article making essentially the same argument.