I often agree with you, but the statement that the Internet founders didn't care about privacy is factually incorrect: Vint Cerf (as mentioned by the sibling comment) is on record as not only being in favor of privacy but wishing the technology had existed for practical cryptographically secure authentication at the protocol level at the time the Internet was designed.
Had the original TCP/IP protocols as they were designed included cryptographic security, the designers of those protocols would themselves have had to be be pioneers of cryptography. This is a little like asking why Henry Ford didn't just start with the electric car. I mean, sure, there was electricity when he started...
