ROFL!
The .40 S&W is essentially a reduced power 10mm. It was invented because some folks (at the FBI, IIRC) couldn't handle the full power 10mm.
In the early 1990s, we called it the .40 Short & Wimpy.
“In the early 1990s, we called it the .40 Short & Wimpy.”
Thus displaying your ignorance for all to see. Look at the kinetic energy available in most .40 rounds and you’ll see that on average they have more energy than most .45 rounds. There are a few +P rounds for .45 now that have more energy than the .40 but not many. The 10mm is overkill in a police application. The .40 also allowed the manufacturers to make a more potent pistol with high magazine capacity on 9mm frames. But hey, you keep believing that .45 is a death ray.
Some FBI folks == female FBI agents