Is your town beseiged by bandits? Raided by robbers? Marauded by Mafia? Yes? Well then call the boys in blue! ...on second thoughts, don't call the boys in blue, they have a track record of detonating huge bombs in the middle of town. Instead you should call the police.
When you see a man in a crowd wearing one of these helmets you immediately know he's a respectable member of society with boundless authority. At least you better know or you'll be getting a beating followed by a ride to the station.
Always have a backup plan for when things get out of hand, and for police forces this means an armoury big enough to supress an entire nation, including a vast collection of non-lethal weapons - more pain less paperwork.