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It was Isidur himself, Aragon's great great grand father (maybe add a couple extra "great" in there) the one who could have destroyed the ring yet did not. It's not so easy to assume that Aragon would be able to let Frodo go.
And as someone said on another topic. What if Aragon had carried the ring? well, for once, if he reacted like Frodo and claimed the ring for himself, Gollum would have NEVER been able to bite the ring off... so maybe knowing that if he followed Frodo the ring would have most likely never been destroyed anyway, he let them go.
That's my take on it, anyway... he realized that he would have been just as dangerous as he could be useful.
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