There is a big difference between providing government the ability to decrypt messages with the proper legal authorization or in order to prevent terrorism and not encrypting in the first place. As other stated it allows us to send sensitive information to family or others with a need without worry that the crooks are reading easily. I also don't want Google or Facebook to read my messages so they can sell that information to others.
We need encryption and maybe a need to break it for the proper legal reasons.
If the government can decrypt our data then so can others, there have been too many leaks by governments, what if the encryption key falls into the wrong hands!