[FairyKing]

I generally agree with the other people here, and I think the way Kamen Riders use the same powers as their villains is symbolic of how they fight for people's freedom against fascists, dictators, conquerors, etc. It's all about choice. It would be easy for a Kamen Rider to become a servant of evil, either joining with the monsters or becoming just as bad (evil Riders can be seen as proof of this). But a true Kamen Rider is a force for good, not because there's anything inherently good about their power, but because they choose to use it for good. In other words, Kamen Riders don't just fight to free other people from evil's control, they also fight to free themselves.