I'm not sure that the honor / shame of suicide issue comes into play, I'm not convinced that the bombers view themselves as committing suicide.
The islamics always use a term that is translated as martyr. The labeling of them as 'suicide bombers' is in error.
I believe that they view themselves as warriors. They carry out their orders joyfully, evidently believing that they will enter paradise. I would believe that it is easier to be motivated if your culture has a victory
They are pumped up, attacking the infidel to protect their homeland. Not depressed as suicides are considered to be.
They also know that their allies in the media will give them at least 1 - 2 minutes of air time per show per event for each "suicide". This is "free advertising" for the terrorists.
If the 'paradise' & MSM support factors did not come into play, we would be hearing about another sniper shooting. Whether or not it was connected to the islamic terror organizations, the DC sniper incident proved that they couldn't trust that route since their message might not get out ('We are looking for white guys in a van'). The islamics learned that if they didn't control the message + the messenger, the islamic terror component could be censored.
That's exactly what I'm referring to as "honor." Their "martyrdom" brings them, and their familes honor (see Saddam's $$ paid to the families).