This was too long ago for me to still feel passionate about it and we probably shouldn't turn the topic into a long discussion about this but if you're curious (KnK movie seven spoilers) The glasses dude was like "Shiki don't you dare kill this mass murderer, killing is always wrong and I'll never forgive you", which was extra stupid because it's not like they had some other plan to deal with him. I'm also of the opinion that sometimes people just need to be killed so this element didn't work for me at all, especially since Shiki had already killed people by this point in the story and he didn't care, and he didn't care when that other girl killed people in movie three but oh well. Then Shiki tries to deal with the killer but she's handicapped because she can't kill the guy so of course she gets captured and the killer starts undressing her and drooling on her in one of the most uncomfortable, meaningless scenes I've ever seen. Then the glasses dude tracks her down only to get taken out by the killer, fed a supposedly lethal dose of drugs (which doesn't kill him for some reason) and then he's stabbed in the head (but of course the mass murderer didn't kill him, it's not like he's good at killing people or anything and of course he didn't check). Then Shiki kills the mass-murderer anyway and the glasses dude stumbles in and is like 'lol that's fine I forgive you' so that whole awful build-up didn't even amount to anything. It was like the movie was designed from the ground-up out of plot elements and character motivations that I wouldn't have liked even if they were handled well, and they weren't handled well at all.
Plus one of the major plot elements was literally a Simpsons joke. A drug ten times deadlier than marijuana! ---