Doesn't a system like Tor prevent MITM attacks as long as you connect only to .onion sites? Isn't this solved too in I2P and Freenet? Maybe the Web isn't the

Doesn't a system like Tor prevent MITM attacks as long as you connect only to .onion sites? Isn't this solved too in I2P and Freenet? Maybe the Web isn't the right tool because everything is in the open.