The psychiatrist did what he/she did to cover their own ass. Those questions are mandatory procedure and if someone is potentially going to hurt themselves and you knew and decided 'ah probably not', then it is YOUR fault. Nobody's going to take that chance.
That's simply knowing how the game works - the same way you're supposed to pretend you've gotten along with every workplace you've ever been in during an interview to avoid raising red flags. There are many many more examples of unspoken social rules you simply have to learn.
Being smart has the advantage of having the capacity to catch up and make up for traits you naturally aren't good at. An average person does not have that luxury - if they're born unattractive, they have almost no way to overcome that as one simple example.