On topic: the two statements don't contradict one another.
There are a couple of ways to assess this without contradiction.
For one, it could be a matter of time. Note that the first statement uses the terms 'saw' and 'sought.' As such, it could very well be that this was his opinion of them when he first became aware of their existence. On the other hand, the second statement uses the term 'are' which would indicate that it was his opinion of them at that particular point in time.
For two, it could simply be that they both apply simultaneously. In other words, he seeks to protect them, but recognizes that their 'tendency' to align with and serve the most powerful being around (a culture which finds its origins before they ever left Freneskae). This could even lend credence to Zamorak's opinions of stagnation as Zaros could very well have been trying to (for a lack of a better term) 'civilize' them much like he did the vampyres.
For three, given how he was introduced to the Mahjarrat, it could very well be that having them serve as mercenaries
was
his way of protecting them. He made them a ritual marker so that they could renew their energies rather than just bleed out their power and die, and granted them positions within his empire to exercise their individual tendencies and abilities with reasonable safety (ex: Sliske became head of the secret police, Zamorak led the armies, Azzanadra led the bureaucracy, and Kharshai served as Inquistor and Tribunus (acting as a go between for the three groups)).
There simply is no contradiction of truthes here.
09-Dec-2016 17:28:30