Butcher says "as long as there is Vaught there will be supes and it's just a matter of time before one of them becomes the next Homelander" to justify killing all the supes, but the problem as we all know is capitalism and they are literally in a revolutionary moment where they could actually end it with the supes becoming immortal folk heroes but no, mass slaughter because vengeance on the one that he hates is not enough he just wants to kill all the supes out of spite and frankly sure there is an argument to be made for that but that still ain't fixing the rest of the problems with capitalism.