Found something on a usenet forum:
"I think the more cowardly are those who masterminded the attack: they used the suicide terrorists as their instruments and have disappeared into the shadows without even having the courage to stand up and claim responsibility for their acts. I think this is what is meant when the terrorists were described as being cowardly. The people who were actually on the planes were more deluded than they were cowards."
And
"Perhaps the idea is that it is cowardly to make a sneak attack, especially
on a defenseless civilian target, rather than confront an armed enemy face
to face."
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Ziroc™
Ironworks Webmaster
www.tgeweb.com/ironworks