Never let facts get in the way of some American-Bashing.
Normally the stereotype would be that the American should be fat, utterly uninterested in visiting any other part of the world, and unwilling to eat anything that wasn't deep fat fried and came through a drive-thru window.
But the stereotype can be altered to any degree necessary if the end result is some good old American-Bashing!
This "hexapus" does in fact appear to just be a DNA misfire of a regular octopus. Eliminating it from the gene pool is probably doing the octopi a favor, since ditching two of their legs certainly doesn't seem like it would have an evolutionary advantage.
This thing was going to get eaten by something eventually. I'm not sure it being a human is any more tragic than if it had been one of it's fellow sea creatures.