Wrong is almost always contextual. If the cost of a false positive is that someone dies, and the cost of a false negative is that development is slower, guess which one is chosen?
Slow development also costs lives. One of the major causes of accidents in small plains is simply running out of fuel because the pilot forgot to fill up on the ground and or did not check the fuel gauge in the air. Now, there are a lot of ways to prevent these accidents, but at some point you need to change basic design elements and not just make a longer check list.