What you just said is exactly what make you mathematicians reasoning flawed. "It's only 2 TU to drop it". Yeah, but then you need to pick it up again. And then, you might actually
need those 2 TU at that particular time to save the life of your other squaddy... Those odds, you fail to calculate.
If we weed out both of our reasoning to what exactly make the difference between you and me, I'm willing to wage it all come down to the fact that all my own reasoning is done with suffering the fewer casualties possible, while you have effeciency in your top priority.