Okay - moral nihilist (MN hereinafter) speaking here -
If everyone would take care of themselves and let other capable adults take care of themselves - I truly believe things go a lot more smoothly and happily for everyone. Otherwise, in my experience, it gets all gunked up. Taking care of one's self and leaving other capable adults (and by capable adults I mean those not adjudicated incompetent - not just those who make other decisions than one would themselves make) to handle their own lives, to ask for what they need, and to be able to hear and handle no if the object of the request does not want to do something.