Its 'realistic' might have been better way to put it.
I think if you add the 18 points to hamilton's score it would be a more accurate reflection of how well they've performed but that's just me.
(I know you could add some points for button in monaco but that was at the start of the race and then we could consider hamilton in oz with webber etc ec, Barcelona is the only one cut and dried for me.)
I say that because 6-2 is a pretty wide gap but button has managed to finish just behind lewis for his 2 wins so the points should necessarily be closer than 6-2 would reflect.
A gap equivalent to 10 points in old money I think would put them both about where they should be relative to each other on merit so far this season.
That basically gives both drivers full credit for all their performances, simply that that means hamilton gets points for his efforts in barcelona which obviously aren't reflected in the table.
