In the years since, due to globalistion and cross-breeding, those cats have spread out world-wide, and spread the ideology to what were ordinary domestic cats.
Because cats are stealthy in the first place, and even more so indoctrinated in the Ninja arts your only hope of protecting you stuff is to shout "Shintaro" frequently.
At the very least it will scare the cats away. A worst case scenario is that you will be taken away to a "sanitorium" for a rest.
If this is the case take your ships with you and rest easy, because they don't let cats in.