Because it's a logical extension of the research for an amoral or immoral researcher. Are you aware of just how many robotics advances had their origin in research into giving soldiers "superhuman" capabilities? It's not a far-fetched thought, no matter how hard you try to tinfoil it.
Let us assume you are correct:
Are our troops best served by facing such superhuman troops in the future, while themselves UNenhanced..?
Maybe they’d win on shear superior DIGNITY...?
I have my doubts.
Would such troops SUFFER via enhancement..?