Suicide in any form is a cowardly way out. You harm and sometimes devastate others, and in the end you don't have to suffer through their faces.

These guys, though i don't believe they would feel guilty for the families of the people lost that day (kinda a heartless act), caused an entire war between the US and Afghanistan. We(the United States), basically crushed the Al Qaida forces in A'stan. During this process, multiple lives of innocents, perhaps even one of the assailant's children were lost. This is how war is played.
These men killed over 1000 innocent Americans, and luckily got to dip out(dead) before they were arrested by the victim(America) of a mass homicide. They were also just lucky enough to stand back while their country fell into shambles over their actions. This is what Allah wants. His people to suffer in his name.

Tell me this isnt cowardice.