Justification of using this utilitarianism principle in practice requires that there be no assumptions, and that you're forced to make a choice in a situation where you cannot ask for consent. The choice must also rationally weigh the pros and cons the outcome of the choice will have morally on society.
There really is no other way I can reason where you could implement this kind of principle into written law onto a society of people without having more harm come from it than good.
The principle on its own, when practiced by the individual of their own free will, tends to be fine until they get control over other people's lives. That's why consent is so important to have in this principle's practice.
I'll have to paraphrase this, but there is a beautiful line in "First Contact". When asked, but what do you do for money? Ryker replies- "We have no need for money..."
Is that not a beautiful concept? What did you think of the movie? Data has a nice line at the end as well