Their useage is accurate:
guer·ril·la or gue·ril·la ( P ) Pronunciation Key (g-rl)
n.
A member of an irregular, usually indigenous military or paramilitary unit operating in small bands in occupied territory to harass and undermine the enemy, as by surprise raids.
There's only one word that should ever be used for these people -- TERRORISTS. Period.
I suppose for variety, the term "those responsible for over 3,000 dead Americans on 9-11-01" could be substituted.
Word-choice counts.
Also, "small bands" is decidedly different from "one guy with an exploding belt".
Defining a filthy terrorist as a guerilla is insulting to guerilla warfare. A fuller definition of a filthy Muslim terrorist would add:
"---and they have no limits to the depths they will sink to kill, even their own countrymen, women, children, and babies. They will use any means possible to murder or disrupt and overturn the peace; they will even strap a suicide vest onto their own daughters just to murder and maime innocent civilians, no matter if those civilians are their fellow Arab Muslims. A filthy terrorist will even kill a Christian just so he can spend eternity in Muslim heaven indulging in eternal sex with his promised virgins. While a man engaging in guerilla warfare can sometimes be in the right, a filthy terrorist is always a filthy terrorist, no matter how much he fears his false god."