Let's not reward mediocrity. Saying "try your best" all the time devalues the word "best." What was once best is now average. This society spends too much time in the extremes. It's either supreme exaltation or total dehumanization. Is there no such thing as gradients? Creating such skewed lines of "good" and "bad" is similar to the hackneyed "morality" systems found in games like Infamous. Such blatant binary configurations of ethics removes all ambiguity, and in a world full of ambiguity, such a doctrine is dangerous. We have children growing up believing themselves as hot stuff or abject failures when they are neither.
All things in moderation. A little perspective goes a long way.