Police characters generally use a proper technique, and fire one handgun with both hands.
In police oriented shows, procedurals and action shows alike, this trope is largely a villain trait.
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This trope is a standard feature of The Western.
They may also go for an Unorthodox Reloadif they want to show off.
As a matter of fact, real people in these times often wore entire bandoleers of a couple dozen Throw-Away Guns strapped to their body.
Also, accuracy of any kind is rather hard to achieve with two guns, and most times, you'll be lucky if you hit anything you're aiming for at all.
Sometimes the character has two special guns, with individual names and special properties, hearkening back to the samurai stories about named swords with special enchantments.
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