[dancing spawn of ungoliant]

In the good, old Sil it says (Quenta Silmarillion, Ch.1) that 'cause none of the ainur did fully understand the thought of Iluvatar's children in the music, the ainur didn't dare to add anything to them. And if the ainur used their forces in their affairs with elves and men to give a lesson to them, there was seldom any good consequences (even if they ment well).

So maybe they could had avoided the Silmaril bickering and the kinslaying but there might have come other jewels to fight over and other differences of opinions that would have ended bloodily.