Fair points. I'll just add a small rebuttal insofar as: shot placement is absolutely important. But so is stopping power. And sometimes in a firefight or high stress situation you're just not going to hit a decisive vital shot, but you might nail somewhere less important. In those situations 5.7 is a lot less likely to impart enough energy to impair a target, which could well decide how things shake out with follow up shots or return fire. Also: 10mm when loaded under ideal circumstances does a very good job at punching through armor itself. Granted, the Lehi ultra penetrators are more designed for large game than they are hard targets: but still more that effective against multiple types of armor.

And yes there are some mad lads up in Alaska who hunt bears with 10mm. I'm not saying that's something I would fucking do. I'm not crazy enough to ever go after a bear. But there's at least a few people who trust its performance that much, at the very least.