Mistakes are a part of life... But why do people start hating others when they do some mistake. As if they never did one... In fact hating others in itself is a mistake. ( of course there some absolutely abominable mistakes -- blunders to be more specific -- for which even the most chilled out will be going blood-red) but , in general, most of us waste our energies over silly mistakes of others while we can actually help them rectify the situation. I agree that this kinda policy is unacceptable for many ( including my rationale) but there is no pain in trying. If we succeed we will be a better person and if we don't still we'll be considered normal. :-)
P.S: Just try it n see it. You will be more happy.