Are depressed people more realistic?

[naimless]

This is a question as futile as the one "Is the glass half full or half empty". An optimistic person can have a realistic approach to life, same for a depressive person, the problem is to keep yourself moderatly happy/sad. Paraphrasing Nietsche:

"If you fight demons you may turn into one, if you stare into darkness too much, darkness will stare at you"

There is no evidence that you are going to gain or have anything in the future. There is plenty of evidence that death and destruction will be in the future.

I don't know anyone that is happy about death and destruction. The secret to happiness is ignoring evidence.