Geisha Girl said
Not sure why Kenji would either since the Fuma ninja are not considered criminals, nor would it be good for diplomatic purposes... Lord Mitsudaira might get mad if you attacked Sutomu clan members while he is trying to keep peace.
Well, you know, he doesn't really have diplomatic immunity as far as he knows, nor is should he be dashing around and away unless he's done something wrong. And, ninjas generally were spies and assassins anyway, they could operate even at the era of peace, since they do not "belong" to anyone.