An average of more than 10 bombings a day in the United States...

A prediction? Nope--that's the way it was, according to the United States Treasury Department:

...the Treasury Department estimated that there were over five thousand bombings across the country from January 1969 through April 1970 alone.

Peter Collier and David Horowitz, Doing It: The Rise and Fall of the Weather Underground, in Destructive Generation: Second Thoughts About the Sixties, 1989, p. 106.

The Treasury Department estimated that only 8 per cent involved regular criminal schemes like extortion or insurance fraud.

Enric Volante, Former FBI agent ends lengthy silence: The Mafia Bombings, Arizona Daily Star, Feb. 4, 2004

It should be kept in mind that the terrorists in those days weren't foreign Muslims, but mostly home-grown, spoiled, white baby bombers boomers. The Weather Underground was the most notorious of the late-1960s-early 1970s New Left terrorist organizations in the United States. On March 6, 1970, three of their members were killed when one of them, Terry Robbins, was building a bomb in the basement of their town house in New York City's Greenwich Village when he mistakenly crossed two wires, and the building was blown to smithereens. As Messrs. Collier and Horowitz put it (p. 101):

They had found the apocalypse they'd been looking for; they'd finally managed to break on through to the other side; what they found there, however, was not an epiphany of the new revolutionary self but the mundaneness of death.

The chapter on the Weathermen in Destructive Generation is definitely worth reading, especially when one sees the names Bill Ayers and Bernadine Dohrn, two of the movement's most prominent members. They were away at the time of the explosion--Mr. Ayers was doing some organizing in Ann Arbor, Michigan--but Mr. Robbins was Mr. Ayers' best friend. If the names Bill Ayers and Bernadine Dohrn--the movement's leading floozy "babe"--seem familiar, it's because they are among the people pulling the strings of advising current White House occupant B. Hussein Obama.