That's a pretty bold, and broad statement. Do you consider terminally ill patients to also be weak, especially when they finally succumb to their illness? They way depression has been explained and described to me is like an emotional cancer, and it isn't simply the result of a weak mind. There is often a chemical imbalance which produces negative emotions and feelings and it is a very real struggle for many people. Are some people who commit suicide weak? Sure. However, labelling every single one as weak or cowardly is pretty naive. I find those who battle depression and suicidal thoughts, and also continue to live a normal life, to be much stronger than those of us who don't have that struggle; the same way I admire cancer patients who refuse to give up, even if they still lose the fight eventually.
-S