Cars have a lot of bad implications for society. There are a lot of negative effects of cars. They even help criminals escape from the scene of the crime. And yet most people are quite attached to their cars. Cryptography is like that.
Cars empower individuals to control their own transportation.
Cryptography will empower individuals to control their information. There will be some negative side effects, but there will be many positive effects. If we don't have encryption, there will be far, far worse side effects from the unprecedented surveillance powers the government will have. Look, I shouldn't be required to show crypto will have only good effects and no bad ones. I think that technology has eroded our privacy and will continue to do so if we do nothing.