And while we're being told WE can't be trusted with arms,

“We’re the federal government,” Mountain Pure’s comptroller, Jerry Miller, says one pistol-packing fed told him. “We can do what we want, when we want, and there’s nothing you can do about it.”
and
However — as my old friend and fellow columnist Quin Hillyer notes — armed officers, if not Special Weapons and Tactics crews, populate these federal agencies: the National Park Service; the Postal Inspection Service; the Departments of Health and Human Services, Agriculture, Labor, and Veterans Affairs; the Bureaus of Land Management and Indian Affairs; the Environmental Protection Agency; and the Fish and Wildlife Service. Even Small Business Administration and Railroad Retirement Board staffers pack heat! 

These “ninja bureaucrats,” as Hillyer calls them, run rampant. They, and often their local-government counterparts, deploy weapons against harmless, frequently innocent, Americans who typically are accused of non-violent civil or administrative violations.
AND the misuse of SWAT teams, AND the "We're Easy Company assaulting the enemy!" mindset of too many badge-carriers nowadays.  And so on.