Fortunately they weren't good at terrorism
The attack on the tanker was amateurish, as the explosives were not prepared properly. The fertilizer based explosives are difficult to make correctly (the fertilizer and fuel oil must be mixed in the right proportions, and mixed properly). When the explosives are mixed badly, there is a much smaller explosion, and a very slow going one as well. ... All the "low (speed) explosives" could do was dent the hull, while turning the suicide bomber into fish food and his boat into kindling.
Those darned NeoCon Japanese invading Iraq, and all that. What do they expect?