I n 1972, the great German novelist Heinrich Böll described the campaign of violence launched by the Red Army Faction (RAF) since its foundation two years earlier as a war of “six against 60 million”. The writer was vilified for the phrase, accused of sympathy for bombers and murderers. But Böll had highlighted the most important factor in the eventual defeat of the group, of whom one of the last surviving alleged members, a 67-year-old called Daniela Klette, was sentenced last week to 13 years in prison for armed robberies. At the time Böll was writing, the RAF’s bombings, abductions and shootings had brought about the most acute crisis of West German democracy since the second world war. Dozens were killed, more injured, wanted posters and police checkpoints went up all over the country, huge state resources were devoted to counter-terrorism.…