It never says that the Valar are perfect. They are more
poweful than the Eruhini. They might be closer to, but definitely not ideal.
The narrative doesn't need to say "however, they sometimes made mistakes". We
know that. They do not know the future and the consequences of their actions (since Eru's vision was very unclear), and can err the same way Elves, Men, and Drawves can. The might not be
as flawed, but because they have more power, the consequences are bigger.
About Aule: Creating the dwarves in the first place wasn't a very good act. Aside from "mocking Eru", Aule was impatient, he didn't tell the other Valar about his idea, and he didn't even think it through thoroughly. Not very good qualities, are they? When he understood what he's done, he wanted to undo it. In the end, though, we see how any act
ultimately turns to good, like Iluvatar predicted in the Ainulindale.
Fingolfin wasn't in mourning, he was in despair. 'Fey'. Also, he thought there is nothing left to live for, so he might as well challenge Morgoth than just be killed by orcs.
As for Amandil... things don't happen twice (hm. I recall this line somewhere in Narnia. Which of the Inklings copied it off the other?

). The world was saved, and history brought to a climax point, by Earendil's voyage. It couldn't happen that way again (if it did, I wonder if the Ainulindale would sound like a record that got stuck and was playing the same thig over and over again...

). The next time history came to a climax, something else had to happen. It just had to.
Quote:
This is not simply a case of "And Man Grew Proud." It's a case of "And Man...were Men and then were used by a being with powers and abilities far beyond their own. A being who is only at large because the gods were inept."
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I don't really understant what you're trying to say here. Can you elaborte a bit?