Another thing...Why did the elves not fight?

[The Saucepan Man]

I assume that by "on a general level" you mean that while it is a common trait among Elves, it cannot be ascribed to each and everyone of the Firstborn.

I would actually go further and say that it was (in the First Age at least) an inherent part of Elvish nature to consider themselves superior to Iluvatar's other children. Often this manifested itself in a negative way, but I think that, in many individuals (those that you mention, for example), it manifested itself instead in a positive way. Although I would still maintain that it is patronising for the Elves to grant to Men a part of the land which they had claimed for themselves but over which they in fact had no greater right save by dint of having got there first. And, while I do agree that Elves such as Luthien and Beleg came to regard individual Men as their equals, it does not necessarily follow that they regarded the entire race of Man on the same basis.

During the Second Age and certainly by the Third Age, it seems to me that Elves were coming round to a much fuller understanding that that which made them different from Men did not necessarily make them superior, no doubt prompted by an acknowledgement that their time was fading.