That line of thinking in regards to bomb threats is dangerously wrong. Politically motivated bombers often make warning calls to spare innocent people. Today it

That line of thinking in regards to bomb threats is dangerously wrong. Politically motivated bombers often make warning calls to spare innocent people. Today it may seem legitimate bomb threats are rare but this was certainly not the case in the late 60's and early 70's in the US. From the memoirs of Richard Nixon. "From January 1969 through April 1970 there were, by conservative count over 40,000 bombings, attempted bombings and bombs threats-an average of over eighty a day. Over $21 million in property was destroyed. Forty-three people were killed. Of those 40,000 incident, 64 percent were by bombers whose identity and motive were unknown."