In testing 5.56 pierces less through a person than standard psitol calibers so they justify that it's safer. It also pierces more stuff if it misses. Im guessing departments have A LOT of faith in their accuracy.
PDWs aren't really a main gun, more a backup. A marksman can't be lugging a Remington PSS and an m4. A p90 is light enough as a backup. Secret Service even conceal them, try that with an m4.
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