How in the world was torching a KFC considered "revenge" for a suicide bombing? Granted, expecting logic to be involved in this is a little unrealistic - but sheesh!
In Islam, the only assurance of salvation is death as a martyr...so anyone who dies as a martyr is actually afraid (or chicken) of attempting to get into Allah's good graces on their own merits. Thus the "chicken" tie in. Suicide bombers are really the biggest cowards in Islam. Since another term for coward is chicken the muslim mind equates that to burning KFC's.
Now before someone goes and slams this theory remember this, it's at least as ration as the quran.
bttt