There must be tolerance because we have different strengths in a workplace. Some are good at searching for information and producing, while others have a great general education. Some are handy, while others have a good spirit of service. In most cases, the person who is weak in one area has a strength in another. In other cases, someone is weaker in most things, but may still be able to do the work if you consider the person a little tolerant. It is better that someone who is a little weaker can keep the job than that he ends up in an exclusion that is painful for the individual and expensive for society.
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Every individual has something to contribute. Not taking advantage of it is "throwing the money down the drain".