[TokuKnight89]

On certain occasions, you'll have a Sentai that intentionally erases people's memories. In Hurricanger, robots are used to accomplish this so that the team can operate in secrecy as ninjas. In Goseiger, this is done to spare people the trauma of enduring terror and fear and pain and helps the team maintain their anonymity as guardian angels in training. This can seem appropriate given the right set of circumstances, but it could also be construed as villainous given that a monster or interplanetary invasion force is more likely to alter people's minds. Granted, you could argue that villains do it for selfish reasons and a Sentai only does it out of necessity, but a given team still gets something out of it all the same.