"Ignorance is a lack of knowledge, or a willful lack of desire to improve the efficiency, merit, effectiveness or usefulness of one's actions. Ignorance is also a "state of being ignorant" or unaware (not knowing). " -
http://en.wikipedia.org/wiki/Ignorance
This is a tough one. By pure language "suicide" + "bomber" is just a person who should have killed himself by a bomb; which happened. By popular definition however, "suicide bomber" is someone who uses a bomb to kill himself and people around him.
In the first instance, he wasn't ignorant as his actions were effective. In popular definition though, he was a total fucking ignoramus.
Good for him though, for successfully removing himself from the gene pool without any casualties.