Brings to mind the old joke about the schoolboy science experiment where he pulls the legs off a spider one at a time and shouts "jump" to see how high the spider will jump. After he pulls the final leg off and shouts "jump", the spider fails to move. The boy's scientific conclusion was that 'after you pull all the legs off a spider, it goes deaf".
Or in this case "after removing welfare benefits from rioters, they fail to riot'.