People that say they have no faith in people should tell you not to have faith in them. People that say No one can be trusted reflects more about them - it should warn you more about them then believing their warnings of others. Beware of people who think people are Born to be Bad.
I know I am Trustworthy - I know I have no secret agenda - I know I am Honest - I know I am Good - so therefore I would assume I am not the Only one in the World like that - I would assume that there are others Like me.
Someone who knows they cannot be trusted - someone who has a secret agenda - someone who is not honest - They know they can be bad- would assume all are like them - they would have a hard time believing that someone could be that different then them.
I always have a debate with someone I know, who is convinced that All people are born bad and it takes work to be good. I see it opposite - I think All are born Good, but with Genetics, life experiences, chemicals, etc creates people act bad - I also think it is a lot easier to be good then bad - being bad, you have to always cover your tracks - it seems exhausting to me.