In case you can't quite figure out Narc's allure, allow me to quote from the game instructions on the cabinet:

"The Narc Mission:

  • bust Mr. Big and destroy K.R.A.K. criminal empire
  • apprehend all crime suspects
  • seize contraband drugs, $$$, and weapons
And above all

PROTECT THE INNOCENT,
PUNISH THE GUILTY"

Need I say more?