True, but the second Kosh (or Ulkesh) had nothing but bad intentions from my viewing.
The first Kosh, on the other hand, killed Deathwalker because of the negative effects her technology were about to cause. He messed with Lyta, but that probably had something to do with her Psi Corp reconditioning (we'll never know, since Andrea Thompson left the show). And he had a fight with Sheridan that Sheridan won. Hardly the stuff of a villain.