Being expected to do things does annoy me. I'd rather be given free reign to choose the manner in which I go about my altruism.
That being said, I'm not much of an altruist. I would be in terms of something terrible like Haiti, but not when it's something like "help us help obese people".
Yeah, I know a few have genetics issues but the rest don't.
And in individual life, then I'd act altruistically if I feel it might benefit me, so in the end I am not being altruistic there.
Yup, I do help friends, but that benefits me by way of the fact that I get to solidify and preserve the friendship I maintain with them. If I don't value that friendship then yes, it is definite altrusim, but then why would they be my "friend"?
Anyways Monsieur OP, I understand your reasoning, though I'd still donate out of my own accord. I'd just be annoyed that people actually have to go door to door - that implies no one else is donating.