More likely the theories about it being a sacred callender have it. Your question is really akin to asking why did people build Peterborough Cathedral, or any other sacred place for that matter.
I always wondered if Stonehenge is anything like the "high places" in the Bible ..... good question!
New discoveries are always being uncovered. Recently unearthed where a couple of disk like bowls that mark the rising and setting of the sun durring the winter solstace. When the sun is directly overhead, it is right on top of Stonehenge.
Not to forget the laylines intersecting there.
The Ancients were exercising their "acquired' skills and demonstrating Prowess ... by lifting, the then impossible lifting and erecting, of huge boulders ...in shape of the Stone Henge ... So that it be 'known' ... that they, are capable of doing the impossible ... thus be 'feared' ... and respected ...
By the way ... There are also the great stones-built Pyramids of Egyptians and the South American Incas ... and the Great wall of China ... representing such "demonstrations" of Skill, ability and Prowess ... of a people ... the modern Shamans make us wrongly attribute to the Esoteric ... thats Shamanism weaving Myth ... in promoting some personal 'interests' ...
Well, that is still a mystery. There are various theories on this. It could be that Stonehenge was built as a 'calender' so that the summer and winter equinoxes were known.
Some say that it was to guide extra-terrestrials to earth (Salisbury plain is an area with many ley lines and corn-circle activities). It is built in an area known for its iron and bronze age burial mounds, so some think it is just a monument to the dead. Perhaps we'll never know but it is intriguing.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.