Seriously what is with all these strange Japanese music videos (no offense if you are Japanese) they are so weird to watch and to me the text makes no sense :p
I hope the Japanese people got some better music then this or I feel really sorry for them, seriously xD
If you are talking about subtitles, meaning of text is lost in translation. Those whom are multilingual would understand how that works out. No one word can directly translate to another. Once it comes to complex lyrics that are expected to fit the same meter, rhyme, and enunciation of a song, things can never turn out perfect. But if you are talking about the characters, of course, its a different language.
Anyway, there is nothing wrong with their culture. People in other countries can find western hypocritical ideals and behaviors taboo as well. If you were raised to believe in a particular religion, it can be part of your culture that someone else may criticize as weird. To assume that all Japanese people enjoy a particular sect of music because a fanatical group made a music video is misguided. Every person has their own personal tastes, and the reason why these seemingly uncanny videos are so "popular" is probably because of the rest of the world sharing and gawking at it.
EDIT: I'm not Japanese.