Peridot tried to kill Steven and the other Crystal Gems many times.

Lapis tried to drown Steven and Connie, only got stopped because of Greg, and nearly dried up the planet by taking their oceans.

Jasper, instead of killing Steven and the Crystal gems when she had the chance, captured them and planned on taking them to homeworld for questioning.

…and almost everyone sees Jasper as the bad guy, and wants to see Lapis and (Peridot) redeemed ..?