What is tolerance? It is the consequence of humanity. We are all formed of frailty and error; let us pardon reciprocally each other's folly - that is the first law of nature.
Very few of the people who accentuate the futility of life remark the futility of themselves. Perhaps they think that in proclaiming the evil of living they somehow salvage their own worth from the ruin - but they don't, even you and I.