Blanket statements like that may have a grain of truth, but reality is a lot more complex.
For one thing, while .357 Magnum is an effective round, it's not quite the lightning bolt that some people think it is. It's like saying, "They all fall to hardball!" when talking about .45ACP. Reality doesn't always agree.
Also, not all .357 Magnum rounds are "flamethrowers." Plenty of mid-range options.
And not all .357 Magnum "flamethrowers" will "decapitate" someone (actually, none of them will). I used to shoot WWB 110gr SJHP out of a 3" 65. Very nice fireball, visible even in an indoor range. But ballistically, it's on par with 9mm +P, maybe +P+.
Personally, I have no intention of ever shooting full-power .357 Magnum loads out of a 2" barrel. The negatives outweigh any power advantage it may have. .38 Special is just fine with me. But if someone can handle it, who am I to say it's "overkill"? We already have too many people who say, "A 5-shot snub is gonna get you killed!" or "You plan on missing a lot with your 15-shot wondernine?"
Just my opinion.