Why did deidara have to die?

Deidara was fighting Sasuke who was trying to get to Itachi. Deidara had had enough of being beaten by Uchihas and turned himself into a C0 clay bomb by stuffing C0 chakra into the mouth on his chest and blowing up, committing suicide while exclaiming "ART IS A BANG!". Unfortunately, he was not successful, as Sasuke escaped and lived to defeat Itachi.