The sinking of Numenor - a lesson to whom?

[Lalwendë]

There are some facts to be had on the history of Numenor which help. The first is that it wasn't a gift of Eru, but of the Valar. The rules about not setting foot on the shores of Valinor (technically, not leaving sight of the shores of Numenor) were also set by the Valar, and not Eru. It was also Manwe who called upon Eru to do something about Ar-Pharazon's expedition (possibly following Amandil's journey to Valinor to parley with the bosses?).

If you read the discussion between Amandil and Elendil (which I was going to put in a quote but it's maybe so long as to be a bit close to breaching copyright ) then there is a hint that Amandil, if he indeed got to Valinor (this is kept purposefully shady) asked Manwe to get rid of Numenor. Read it, I want to see what you guys think.

Here's a little, and the most intriging part:

Seek out the Faithful that are known still to be true, and let them join you in secret, if they are willing to go with you, and share in your design.'
'And what shall that design be?' said Elendil.
'To meddle not in the war, and to watch,' answered Amandil. 'Until I return I can say no more. But it is most like that you shall fly from the Land of the Star with no star to guide you; for that land is defiled. Then you shall lose all that you have loved, foretasting death in life, seeking a land of exile elsewhere. But east or west the Valar alone can say.'
Then Amandil said farewell to all his household, as one that is about to die. 'For,' said he, 'it may well prove that you will see me never again; and that I shall show you no such sign as Earendil showed long ago. But hold you ever in readiness, for the end of the world that we have known is now at hand.'

Reading on from there, the Valar clearly did all they could within their remit (not being permitted to meddle with Men) to stop the Numenoreans from their plans, even causing an earthquake, which just leaves Sauron looking even cooler to Ar-Pharazon and his mates in a fabulously diabolical scene where he defies lightning. So they called on Eru.

I find it hard to take that Eru would do this in order to teach Men a lesson, as those who were doing wrong were killed, along with a lot of innocents - not just in Numenor but also in Middle-earth as that too suffered huge floods and earthquakes - and who would there be to learn from this? Plus it would put Eru in the position of being an unpleasant figure. I'm quite happy to go along with Macalaure's idea that Eru did not intend to kill these people, just to change the shape of the world (which was something the Valar could not do).

In matter of fact, the perpetrators weren't really punished. Sauron got a fright and legged it from the ruins, while Ar-Pharazon and his Men are entombed in Valinor waiting for the final day, in a strong echo of Loki waiting for Ragnarok:

But Ar-Pharazon the King and the mortal warriors that had set foot upon the land of Aman were buried under falling hills: there it is said that they lie imprisoned in the Caves of the Forgotten, until the Last Battle and the Day of Doom.

Would Eru be so petty as to try a school teacher trick of keeping the whole class behind because one of them has been shooting spit balls? Hmmm...