The UK needs to bring back the hangman and public gallows.
A few muzzlemen hanging “like herring do”(from THE COURT JESTER) might put a “qui-etus” on the rest.
I like the headsman, myself. Middle eastern style, prod the small of the back with the point of the sword, the perpetrator reacts by stiffening and arching his back, swish, avoid the spray.
Stitching their necks onto the carcasses of pigs before dumping them at the door of their imam is just a personal touch.