If you choose not to fight like a ninja, you will die. I think that is stupid. If you need to save your family and friends, you will instead laugh at the ninja and talk to them as they kill everyone you love? You will shout, "Please don't hurt us you evil cowardly ninja." But the ninja kills your family and friends. Now you are an orphan.
What is a ninja? See this. A ninja is a person who does anything cool. That would include karate, boxing, wrestling, judo, etc. Ninja does not mean a person who only does certain types of martial arts. To me, ninja only means fighter. It means Batman. It means super hero. It means Chuck Norris. It means Jason Bourne. It means Seven of Nine of Star Trek. It means Luke Skywalker of Star Wars. It means Rocky and Rambo.
Judo is ninja.
When I say ninja, I only mean fighter of any fighting style. Ninjas can be good. Ninjas can be bad. It is like a gun. See that a gun can be good or bad. Ninja has no real meaning. Ninja is like a car. You can do things in your car. You can run over people and kill people with your car. Same thing with a bike. You can hit people with a rock. You can build things with rocks. You can kill people with rocks.
Some people said there was kind of conflict between the Shogun and the Samurai. Some people said the Shogun is not just a king. Some people were saying the Shogun is not just one person but a bunch of people. That is what I heard.