Feanor Self-Important?

[mormegil]

When do we see this greatness of spirit?

A couple of things come to my mind instantly with that question. These were they who were willing to leave the presence of Illuvatar and come down to help set in order the arrival of his children.

The fact that they had belief in Melkor to set him free shows not ignorance but greatness of spirit. Believing that any could be given a second chance and reform.

As far as redress to Feanor, it was not they who committed the act so what redress do you mean. Also if you remember Feanor didn't give them much time to even think about that before he went and swore his little oath.

The Teleri were set against a departure that the Noldor had to make as a result.

The Noldor didn't have to make any such departure. Feanor and his sons did due to their oath but Finarfin and his host did not make such a depature. And as I already quoted the Valar told the Noldor before they went away that they would receive no aid from them in this quest. So the host that crossed the Helcaraxe were going forward to still be part of Feanor's overall quest.

Without the intervention of Eru they would have separated Beren and Luthien.

This is a rather false claim. As we know Luthien sung before Mandos who was moved to pity and it is written:

But Mandos had no power to withhold the spirits of Men that were dead within the confines of the world, after their time of waiting; nor could he change the fates of the Children of Illuvatar. He went therefore to Manwe, Lord of the Valar, who governed the world under the hand of Illuvatar; and Manwe sought counsel in his inmost thought, where the will of Illuvatar was revealed.

It was through the Valar that Beren and Luthien's fate was able to be decided. They needed further insight and revelation. Again the greatness of their spirit is shown here; they knew that they didn't know all and were humble enough to ask.

All of this talk of Manwe being inept is rather ludicrious as this quote shows. Manwe was, by appointment from Eru, governor of all the land. So it comes to my mind that while not perfect, Eru trusted him to lead and maybe Feanor should have as well. If anybody had the right or position to know Eru's will is was Manwe and not Feanor.

Edit: Cross posted with SpM and I agree with what you said completely.