To judge...or not to judge

This post is inspired by Loulou's post: "Lipstick in my hair".
Judging each other...why are we not more preoccupied with judging ourselves? Why is it much easier for us to pinpoint what is wrong with someone else, but when it comes to looking at our faults and assessing them....we just falter and find it something very difficult to do?
Is this something in our nature, being oblivious to our shortcomings? Or is it just the nature of some of us? Can we control this urge to form an opinion about someone else or is it something uncontrollable?
My personal opinion is that it is controllable! It is......Instead of providing our opinion on what someone should've done but didn't do, why don't we try putting ourslevs in their shoes. We are all human beings......we are all affected by emotions and feelings that are sometimes stronger than any rational thinking. How many times did you offer advice to a friend, but when faced with the same problem, were unable to solve it? The simple reason for that is that it was easy for us to see the solution when our judgement was not clouded by our emotions. I may seem off-topic here, but what I am trying to say is that we shouldn't judge people because we don't know what we would've done if we were in their shoes. Ideally, we shouldn't judge people PERIOD. But I know that that is asking for too much.
Most of my friends tell me that my best quality as a friend is that I'm a good listener. I listen, and if my advice is needed I try to offer it in the nicest way possible. And sometimes, not saying anything is the best you can do. Sometimes, no matter how hard you try, there is nothing comforting enough that can be said to make someone feel better. I have been in situations where a friend of mine would be beating herself up for doing something that she shouldn't have done...and at these times, what she needs to hear is that it's ok...it's ok to make a mistake...we are not perfect....don't beat yourself about it.....you are not a bad person.......it's a good thing that at least you realize that you did something wrong, some people never do. Move on...learn from your mistakes...learn from the mistakes of others....grow......and move on.
I'm not saying that we shouldn't form an opinion about things done around us....of course we should. Otherwise, we will never learn. But what I'm saying is that it should not reflect how we view a person. Our opinion should not give us the right to decide if that person is good or bad. Somehow, that would mean that you are a better person...but are you?
A quote comes to mind: "I have never met a man who was not my superior in some particular" (Ralph Waldo Emerson)