So，plane is much safer

The CIA receives a serious bomb threat to Air Force One.
Taking no chances, they call in a senior partner from McKinsey.
After much deliberation he hands over a bag and requests that it is always present on the plane.
This, he says, would reduce the risk.
This trick seems to work so the CIA decide to open the bag.
They discover a bomb in his bag.
The partner explains.
"Statistics show that the probability of a bomb being on an airplane is 1/1000.
However, the chance that there are two bombs on one plane is 1/1000000.
So, plane is much safer..."
中情局接到一个紧急的炸弹恐吓，说是在空军一号上。
在毫无办法的情况下，他们向麦肯锡公司的一名资深合伙人求助。
在一阵深思熟虑之后，合伙人给出一个包裹并且要求一定要把它放在飞机上。
他说，这可以降低风险。
这个办法看似很有效，所以中情局决定打开包裹看看，结果在里面发现了一枚炸弹。
合伙人解释说：“数据显示，一架飞机上有一枚炸弹的几率是千分之一，但是一架飞机上有两枚炸弹的可能性是百万分之一，所以，这样飞机就更安全了······”

感謝樓主分亯好資料！

So，what？？？？？？、？？