This could be a metaphor for the illegal immigration problem we have now. It also works for the legal immigration problem we have with people who want to not only come to America to subsist on our welfare programs but also desiring to behead us.
I’d point out that the leaping carp would be a great sport fish if they were to be shot with shotguns. In fact this is such an obvious and fun solution to this problem that I have doubts about this being filmed in Indiana. Hoosiers are much smarter than to just sail along decrying the fact that pesky fish are invading their boat. They love outdoor sport shooting in any form and love finding new ways to have fun. To sum up and use the vernacular, “Them boys likes their fun!” These Hoosier proclivities make me fear for the fate of the beheaders when they reach the banks of the Wabash.
I would also point out that these Asian invaders are great eating, as was pointed out in an associated YouTube. That is probably not a metaphor for anything. Probably. But…in Indiana…MAYBE.