[Raynor]

There is a strong that Tolkien went at great lengths to parallel our own world:
-generally

Originally Posted by 1997 BBC interview

G: I thought that conceivably Midgard might be Middle-earth or have some connection?

T: Oh yes, they're the same word. Most people have made this mistake of thinking Middle-earth is a particular kind of Earth or is another planet of the science fiction sort but it's just an old fashioned word for this world we live in, as imagined surrounded by the Ocean.

G: It seemed to me that Middle-earth was in a sense as you say this world we live in but at a different era.

T: No ... at a different stage of imagination, yes.

Astronomically:

Originally Posted by Myths Transformed

At that point (in reconsideration of the early cosmogonic parts) I was inclined to adhere to the Flat Earth and the astronomically absurd business of the making of the Sun and Moon. But you can make up stories of that kind when you live I among people who have the same general background of imagination, when the Sun 'really' rises in the East and goes down in the West, etc. When however (no matter how little most people know or think about astronomy) it is the general belief that we live upon a 'spherical' island in 'Space' you cannot do this any more.

Ethically

Originally Posted by Letter #64

I sometimes feel appalled at the thought of the sum total of human misery all over the world at the present moment: the millions parted, fretting, wasting in unprofitable days - quite apart from torture, pain, death, bereavement, injustice. If anguish were visible, almost the whole of this benighted planet would be enveloped in a dense dark vapour, shrouded from the amazed vision of the heavens! And the products of it all will be mainly evil - historically considered. But the historical version is, of course, not the only one. All things and deeds have a value in themselves, apart from their 'causes' and 'effects'. No man can estimate what is really happening at the present sub specie aeternitaris. All we do know, and that to a large extent by direct experience, is that evil labours with vast power and perpetual success - in vain: preparing always only the soil for unexpected good to sprout in.

closely paralled in:

Originally Posted by Myths Transformed

But, if we dare to attempt to enter the mind of the Elder King, assigning motives and finding faults, there are things to remember before we deliver a judgement. Manwe was the spirit of greatest wisdom and prudence in Arda. He is represented as having had the greatest knowledge of the Music, as a whole, possessed by any one finite mind; and he alone of all persons or minds in that time is represented as having the power of direct recourse to and communication with Eru. He must have grasped with great clarity what even we may perceive dimly: that it was the essential mode of the process of 'history' in Arda that evil should constantly arise, and that out of it new good should constantly come.

Also, when in The new shadow he says :"since we are dealing with Men it is inevitable that we should be concerned with the most regrettable feature of their nature: their quick satiety with good", I am pretty sure he means humans as well..