Are you suggesting emotions are necessary to goal-oriented behavior?

There should be some evidence for that claim; we have people with diminished emotional capacity in wide range of forms. Do individuals with alexithymia demonstrate impaired goal-oriented behaviors?

I think there's more to emotion as a motive system than the brain as a motive force. People can certainly choose to stop taking certain drugs which induce emotional highs. 10% of people who start taking heroin are able to keep their consumption levels "moderate" or lower, as compared to 90% for something like tobacco, according to one random and hardly authoritative internet site - the precise numbers aren't terribly important. Perhaps such altruists, like most people, deliberately avoid drugs like heroin for this reason?