No, it is not simple. It is simplistic. @mark5000 asked you about “legal complexities and practical considerations of mass forcible removal”, you cannot go “hey it is simple” and ignore the issue!
For example, my country has failed to create a land registry database during peacetime. The effort has taken 35 years. It is still ongoing (and it will be probably for 35 years more) and the result was a country-wide mess during peace-time with everything intact.
And you think that the same thing can be done in a warzone where things could have easily be turned into rubble or been built over. 
Give it some thought please.
Unless you expect us to agree that it will be made good by magic and good will.
I do not think that anyone here wants war and suffering to exist and we all agree that it would be great if all conflicts could end effective immediately and people get along and solve their problems diplomatically. However, from that wish to reality there are a lot of practical problems that cannot be easily dismissed.
What you are doing is saying that solving world poverty is simple by saying “just give everyone free money and let it rain food from the sky”.
If only that could happen/work.
I think you over-estimate the good will and our drive to improve, as a species. The facts, as you said, point to our inability, through millenia, to understand that things and accomplishments are transient.
Similar warnings exist in our western culture as well (e.g. Solon’s encounter with King Croesus in Herodotos’ tales - thought Tolstoy’s version of it is more famous now -, Lucian’s Dialogues of the dead (especially no. 3, 5, 8 and 20)) and I could think of more (even the Bible itself contains such warnings and Carl Sagan’s famous Pale Blue Dot is the most recent example I can remember), but who cares? Even finding the links was a waste of time, noone will probably click/read/consider them and if they do, it doesn’t matter because, as a species, collectively, we keep doing the same things, over and over and over again. What difference does it make what a few people understand something or not? Our ability to learn and “astonishing capacity” seems to be focoused on growing mostly in technological matter, not behavioural.