I mean LoSS and Slicer fell to their deaths, two Scorpios were squished, Basher was killed by the elemental power of the Toa, and Kulta, erm, I don’t actually know what happened to him.
But in all seriousness, a lot of the weapons used in Bionicle could be classified as “too violent”, such as Lewa’s axes, or Onua’s upcoming drill hammer thingy.