115000 represents a very small percentage.
As I say, I am not decrying the individual acts of heroism. But I am trying to get into perspective for readers here how "common" the MM was, and why it was referred to as it was.
If I accepted your figure of 5 million who served, that would have meant the 1 in every 43 men got the MM.
But it was not instituted till half way through the war, and on top of that only men in the front line could generally have expected to get it. So in front line soldiers, that is among those who were expecting rations to be sent up, perhaps 1 in 25 would get the MM before the end of the war.
4,100 DSMs were issued during World War I, and that is a rarer decoration
You are unfortunately construing the maths as an attack on the medal recipients, it is not.