On the face of it, trying to change that destruction would seem like the moral thing to do, and it may have been tried by Spock or other parties after the events of Trek XI. However, the destruction of Vulcan in this universe may lead to a chain of history that bypasses other potential calamities. Just like Enterprise-C
had to be sacrificed to prevent a Federation-Klingon war in "Yesterday's Enterprise
," Vulcan's loss might have a similar effect on the future of the Abrams universe. Nobody wants billions to die, but it increases the potential drama in later stories because we do not know what will happen next.