Frankenstein: Victor's dilemma

Mary Shelley's Frankenstein is making me have very mixed emotions about our Mr. Victor.  At this particular point in the novel, I wanted to both smack some sense into him, and grudgingly agree with him.  He was aware of the strength and wrath of the creature.  Why on earth would he be so stupid then?!  "I thought with a sensation of madness on my promise..and trembling with passion, tore to pieces the thing on which I was engaged.  The wretch saw me destroy the creature...and with a howl of...revenge, withdrew" (Shelley, 121).  Can't see anything possibly going wrong with THAT series of events.  I understand that Victor is caught between two unknowns.  If he were to complete the female creature, there would be no telling what she would do.  He could very well unleash a heartless monster on all of humanity, or a peaceful mate for the male creature to hide with.  If he went back on his word, there was no telling what the creature would do.  Why wouldn't he take the chance of making another creature?  He had to have known by then that the creature's form of taking revenge on him was by killing one of Victor's loved ones.  How could Victor think that he or anyone he ever cared about could ever be safe again after enraging a very strong, very clever, and very dangerous monster such as the one he had created?