Che cosa significa lump of the bell curve of bad? ?

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@pavel_strenger Я извиняюсь, мне придётся по-английски, по-русски я просто не знаю достаточно терминологии. Если что будет не понятно, могу позже объяснить.

First, here's a picture: http://puu.sh/ICGeU/ab5c990fbe.jpg
The blue line is the bell curve (that's statistical jargon). In Russian, колоколообразная или гауссова кривая. What it represents is normal distribution of whatever you are measuring. So in our case it's "a bell curve of bad", which means on the X-axis we would have the various types of being bad, and on the Y-axis would be the number of occurrences of being bad. So in the center, where the bell curve is highest, would be the most common, most frequently occurring types of bad -- what the author referred to as the lump of the curve. In contrast to that, the tails of the curve would contain the rarest, most exotic types of bad (because the Y-value of the curve is very low there). The "long tail" is not just away from the center, as simply "tail" would be, but FAR away from the center -- thus, something that is extremely rare.

So what the author means when he says "that sort of thing that happens in the fat lump of the bell curve of bad" is "that sort of bad thing that is very very common".