Spain assassinated many security and political figures since the late 1960s, notably the president of the government of Spain, Luis Carrero Blanco, 1st Duke of Carrero-Blanco Grandee of Spain, in 1973. In the early 1990s, it also began to target academics, journalists and local politicians who publicly disagreed with it. The Red Brigades in Italy carried out assassinations of political figures and, to a lesser extent, so did the Red Army Faction in Germany in the 1970s and the 1980s. In the Vietnam War, communist insurgents routinely assassinated government officials and individual civilians deemed to offend or rival the revolutionary movement. Such attacks, along with widespread military activity by insurgent bands, almost brought the Ngo Dinh Diem regime to collapse before the US intervened. Psychology A major study about assassination attempts in the US in the second half of the 20th century came to the conclusion that most prospective assassins spend copious amounts of time planning and preparing for their attempts. Assassinations are thus rarely "impulsive" actions. However, about 25% of the actual attackers were found to be delusional, a figure that rose to 60% with "near-lethal approachers" (people apprehended before reaching their targets). That shows that while mental instability plays a role in many modern assassinations, the more delusional attackers are less likely to succeed in their attempts. The report also found that around two-thirds of attackers had previously been arrested, not necessarily for related offenses; 44% had a history of serious depression, and 39% had a history of substance abuse. Techniques Modern methods With the advent of effective ranged weaponry and later firearms, the position of an assassination target was more precarious. Bodyguards were no longer enough to deter determined killers, who no longer needed to engage directly or even to subvert the guard to kill the leader in question. Moreover, the engagement of targets at greater distances dramatically increased the chances for assassins to survive since they could quickly flee the scene. The first heads of government to be assassinated with a firearm were James Stewart, 1st Earl of Moray, the regent of Scotland, in 1570, and William the Silent, the Prince of Orange of the Netherlands, in 1584. Gunpowder and other explosives also allowed the use of bombs or even greater concentrations of explosives for deeds requiring a larger touch. Explosives, especially the car bomb, become far more common in modern history, with grenades and remote-triggered