You could make the same argument of modern technology. Our entire evolution has consisted in advances that have made us more and more dependent on our artifices. Likewise with the Highborne (and their descendants) or the Eredar and the arcane. All things have their costs and benefits. So again, what some may call 'corruption', others will call 'evolution', and like I said, the perspectives on the arcane in Azeroth are by and large written by unsympathetic druids.
Regarding the druids, interestingly many used to be arcanists.