It's certainly possible for drugs to destroy society and the war on drugs to destroy society. The two aren't mutually exclusive, and in fact they're often correlated in the more conventional type of wars: saying that the bombing of Dresden was bad for Dresden doesn't imply that Nazi rule was good for it, nor does saying that Nazi rule was bad imply that the bombing was good for the city.

This is why declaring war is traditionally a last-resort approach, appropriate only when you believe the inevitable evils of waging war are worth enduring to eliminate the great evil you're facing. If the evil you're facing is not that great, war is not the right tool.