Although the bomb squad personnel wear heavy helmets, flak vests, and body armor while handling the bombs, they wear no gloves. No real bomb disposal expert would ever leave his hands unprotected.
The Common Man is supposedly very intelligent, yet he makes two obvious mistakes: First, he stashes his bombs in places where they could easily be found: on a train's luggage rack, under a bus seat, and in a public trash can. Second, his headquarters on the open roof of a tall building could easily be seen by hundreds of people in the adjacent buildings.