It's probably just as easy to say that funding comes from the war economy rather than research. However, I am also not entirely surprised that it's the high levels of funding combined with the adversarial nature of war that pushes the envelope of things getting bigger, smaller, faster, higher, etc.

However, while we do see this trickle back into civilian life, I imagine that if funding were directed towards solving civil needs instead (housing, food, water, environmental contamination, energy, community centers, schools, etc) we'd see very different things produced, and often more well suited for peaceful purposes.