When I click on a link someone has sent me, I want to see what the server at that link is sending me. I don't want to see what a MITM is sending me. Maybe I sh

When I click on a link someone has sent me, I want to see what the server at that link is sending me. I don't want to see what a MITM is sending me. Maybe I shouldn't trust the person who sent me the link and/or the method it was sent. But maybe I have good reason to. Why should you assume weaknesses in a previous link on the chain in order to justify a weakness in the link of the chain that is being discussed?