Is it essential to build the 3rd Temple to restore peace in the world? If so, why? And why can only the Messiah do this? And how should this goal be achieved in a way that keeps everyone happy?
We see throughout the Navi that David does not want people killed on his behalf (Saul, Ish Boshet...) yet he does not get to build the Temple and the most common reason that David is told no by Hashem ...