Yes. A concealed weapon hidden under clothing. A decent caliber and extra magazines. When one of these goons gets killed trying to hurt others, the others will think twice.
When one of these goons get killed, the others will be joined by thousands of other amish, who will proceed then to burn down the city, helping themselves along the way to flat-screen TVs, IPads, and lots of other toys at steep discounts. It will be a repeat of the race riots of the seventies.
I lived through two of those, one in Augusta, Georgia, only about 90 miles from Greenville. It will make for an ugly, nasty summer, and many of the folks who have acquired scary-looking rifles over the last year or so will find occasion to use them. I already make it a point to drive 30 or more miles away from urban centers in my travels. I think I'll increase that to 60.