I can partially agree. But being one of those depressed and alcoholic type of people, thinking positive does not do jack shit. All that does is blinding yourself to reality and open yourself for being fucked over.
That is like saying you are best friends with the school bully who kicks your ass everyday and takes your lunch money, but he is still your friend. Where did positive thinking get you?
Another example is your parents telling you "if they pick on you, there are leaving someone else alone". That is the power of positive thinking by someone else at your expense.
So please explain what the fuck the power of positive thinking is supposed to do again?