The same old same old japanese storytelling system. To summarize it; no evil looking guy is truly evil, Japanese culture is the best, rice, rice, rice, girls commenting on each other's boobs, rice again, lame characters... I hope I didn't leave anything out.
Actually it's not that simple, we know some rulers that were bisexual and everyone before middle age was bisexual (more or less). Back then, peoples didnt have this kind lf thought since they werent only into one gender to begin with