"What is probably not wise is trying to lock your future self in with precommitments."

The outside view suggests that as I get older I will probably get less idealistic and less altruistic. For example, from something I happened to be reading this morning:

Bob’s lack of ambition, which had initially seemed so noble, began to irritate Jacqui. “Everybody else in the animal-rights movement was growing up, starting to settle down, moving out of the squats and all that,” she recalled. “He was already a lot older, and he was not progressing.” While Bob was in the pub, plotting direct actions, Jacqui was at home, worrying about money.

(In this case Bob hasn't "grown up" because he's actually a government spy assigned to the animal rights movement, but if anything that makes this stronger.)

I expect that morally I will still believe that we should be helping others, I just will be pulled more and more to spend money on myself and people around me. Commitment here isn't to lock myself into the values of a much younger self so much as keep myself doing what I have all along thought was the right thing to do.