Going beyond Fragging - Wiki, one might look at:

The Hard Truth About Fragging, by Peter Brush (Vietnam Point of View, July 28, 2010):

Since most fragging incidents did not end up in the court system, it is more difficult to establish a profile of the perpetrators themselves. However, a 1976 study conducted at the U.S. Disciplinary Barracks (USDB) at Fort Leavenworth gleaned some general characteristics of likely individuals who committed fragging. Of 850 inmates in the USDB population at the time, 28 were identified whose actions, based on their courts-martial transcripts, matched the fragging incident profile. On average, they were 20 years old and had 28 months on active duty. About 20 percent were African American, and about 7 percent were draftees. Most had enlisted in the service and supported the war. They had attained only a low level of education and were considered "loners." Most were in support units, given jobs for which they had not been trained, and reported little job satisfaction. They felt "scapegoated" and showed little or no remorse for their crimes. Almost 90 percent of these men were intoxicated on a wide assortment of substances at the time of the fragging, which mostly occurred at night. They admitted to little planning beyond talking to others, and most did nothing to avoid capture. Consistent with the command structure at the company and battery level, captains and first sergeants were their most common targets, and 75 percent of the perpetrators had been at some time involved in a verbal or physical altercation with their victims.

In terms of motive, the victims were viewed as having somehow denied the offenders of something they desired, such as promotions or transfers. The victims were perceived as a threat to the offenders. Only two of the 28 offenders studied claimed race was a factor. According to the authors of the study, the easy access and use of drugs was an essential factor in the assaults. That conclusion was further buttressed in a 1976 article in the American Journal of Psychiatry by Thomas Bond, which claimed that illicit drug use, so much more common in Vietnam than in other wars, tended to reduce any inhibitions the offenders may have had about assaulting superiors.
More recently (January 1, 2011), Fragging: Why U.S. Soldiers Assaulted Their Officers in Vietnam (by George Lepre); as reviewed at FP by Tom Ricks, Best Defense bookshelf: 'Fragging,' the Vietnam War's characteristic crime (8 Mar 2011):

What did surprise me in this illuminating book was the basic profile of soldiers who fragged NCOs and officers (that is, tried to kill them with hand grenades). In this carefully researched study, Lepre reports that:

--Most fragging occurred in the noncombat support units in the rear, not in front-line combat units. (p. 31)

--The attacks often killed the wrong person: "of all the army officers who are known to have died in fragging incidents during the Vietnam War, only one was the intended target of the assault." (p. 44)

--Four would-be fraggers were killed in their own attempts to assault others. (p. 47)

--The last Vietnam fragger to get out of jail was William Sutton, who was released in 1999, his time extended by a parole violation. (p. 200)

--Not all fraggers left the military. Staff Sgt. Alan G. Cornett Jr. [author of Gone Native: An NCO's Story], who was in Special Forces, fragged his unit's executive officer, Lt. Col. Donald F. Bongers, who was wounded but not killed by the grenade blast. Cornett was convicted, did a year's confinement, some of it at Fort Leavenworth's disciplinary barracks -- and then served another 17 years in the Army, retiring in 1989 as a master sergeant. (p. 82)

--Most fraggers already had had a brush with the military justice system before committing their fragging offenses (pp. 76-77). More typical of fraggers than Cornett was PFC Richard Buckingham, a cook in the 538th Transportation Company. Lepre goes on:

The government eventually withdrew its charge against Buckingham, which who would have faced his second court-martial in the space of a year: in June 1970 he had been tried in West Germany on charges of rape and sodomy, and was acquitted. Buckingham left the Army in 1972 but couldn't stay out of trouble: only weeks after his discharge, he strangled a seven-year-old girl to death and was sentenced to life imprisonment. A judge released him in 1999 in the belief that he "would not pose an unacceptable risk to society" but Buckingham was quick to prove him wrong: in 2002, he was sentenced to serve several more years in his native Ohio for assaulting yet another female. (p. 118)
Regards

Mike