In addition to what everyone else has said, having everything be encrypted means encryption isn't "special", there's no metadata that indicates that the communi

In addition to what everyone else has said, having everything be encrypted means encryption isn't "special", there's no metadata that indicates that the communication contains secret data due to encryption. If people don't encrypt non-sensitive traffic, then sensitive traffic stands out. So there's a sort of civic duty element to enabling TLS (or using encrypted messaging, etc.).