That's fine, do what you want. So long as you don't expect people from other worlds to abide by yours when they don't come from there, might have never come across those sets of rules or thinking, eh?

As for why people from your own world still might disagree, many people think what might be good for one person, might not be as good for another. Just as one of my friends does better eating enough to feed a small army, but my other friend eats like a bird. If you say they both have to eat a medium amount, they'd both get sick.