There is on the order of 7000 deaths per year from terrorism.
Most of it is terrorism within Afghanistan and Iraq. Global terrorism has far lower numbers of about 300-700 per year (other than in 2001).
2-3% are likely arson, which would be 4000-6000.
Terrorism is a subset of violent crime. Al Qeada are more ambitious and foreign street gangs (like the Bloods and Crips in Los Angeles).
FBI’s national data of gang-related homicides showed: from 288 in 1985 up to 1362 in 1993.
There were at least 30,000 gangs and 800,000 gang members active across the USA in 2007 up from 731,500 in 2002 and 750,000 in 2004 By 1999, Hispanics accounted for 47% of all gang members, Blacks 34%, Whites 13%, and Asians 6%.
15,241 people that were murdered in the United States in 2009 and there was an estimate of 12,400 murders in Mexico The US has three times the population of Mexico.
Arson has 300-500 deaths per year in the USA
17,034 murders in the United States in 2006 (2-3% of murders are arson)