What emotion is more basic than fear? Even amoebas scuttle away in fear when they are prodded. It can lead to many things. Fear alone would most likely lead to increasingly complex unsound emotions.
Suppose this hypothetical (and probably correct) argument:
There is love and there is fear. They are conscious affection and unconscious excitement respectively. Having love (a strong interest or affection) surely cannot mean having a strong dislike (hate). Therefore hate is a product of the other basic emotion, fear. Evil cannot be the sole product of love alone since it is mutually destructive and involves affection for nothing.
Therefore evil is the product of fear.
(Note: Love and fear can supposedly be ultra-simplified to attraction and detraction respectively when considering non-humanisitc terms)
Getting back to the original situation: How can something as basic as fear be used to teach something as complex as morals? Morality requires awareness and rational thinking, sound decisions. Of course fear can be drawn upon to get someone's attention (yelling at someone who is about to walk off a cliff) but the primary tool MUST be love. If a child ONLY fears a parent and there is no love, we can be sure that morality will not be learned.
Wrong.
Selfishness is more basic, as with fear you're still GIVING something to someone.
With selfishness, you're giving nothing.
And hand in hand with selfishness is hate.
You're still trying to sidestep this dance.
And you're getting tangential.
I answered your question, you don't like the answers.