On the 'meant' thing, I remember Frodo saying in Unfinished Tales:
'But still, you could not make us. You were not even allowed to try.'
Or something very similar.
All the same, Frodo's position is a bit like Frederick's with the Pirate King and Ruth appealing to his 'sense of duty.'

Albeit in a much more serious sense.
P.S. Come back, Ivriniel! Your devil's advocacy stirred my sluggish posting fingers. (It helps that talking about Frodo is one of my absolute favourite things to do).