Flight 253 attack - The rest of the story!

What intrigued me about this case and the shoebomber case is why they didn't just go to the washroom to light the fuse and chose to do it in plain sight where they might be stopped? That never made any sense

 

if someone sees a conspiricy around every corner they are paranoid.

 

Lame answer as usual, does not at all cover any of the realities of this story.