Our ancient scriptures never classified passion, fear, anger, etc, as bad qualities. They are only weaknesses . That is why it was said:
आहार-निद्रा-भय-मैथुनं च समानमेतत्पशुभिर्नराणाम् ।
धर्मो हि तेषामधिको विशेषो धर्मेण हीनाः पशुभिः समानाः ॥
"food, sleep, fear and mating, these acts of humans are similar to animals'. Of them (humans), dharma (right conduct) is the only special thing, without dharma humans are also animals."
(hitopadeshaH kathAmrutam http://blog.practicalsanskrit.com/2010/01/human-or-animal-what-is-difference.html)
Through this sloka, we are told about common traits to both animals and human beings and about that quality DHARMA, which separates animals from Human beings.
Again, passion, fear, anger, etc, are not weaknesses in all cases .
We have to understand that passion, fear, anger, etc, may be impediment for a person desiring to progress SPIRITUALLY, but not to a student or a householder.
If a student does not have passion towards his studies, he can not gain knowledge.
If a parents do not show anger towards misbehaving children, they can not set them on right path
If a person does not learn to fear about hazardous materials like electricity, poisonous chemicals, explosives, etc (or) wild animals (or) dangerous situations, it will pose threat to very life of humans. Are not animals running away out of fear, when a threat to their life has been perceived?
In respect of humans desiring to progress spiritually, passion, fear, anger, etc, these are to be considered weaknesses only but not bad qualities.
Unless the spiritual aspirant overcomes his weaknesses, i.e., passion, fear, anger, etc, his progress will be little.
The life of Sage Vishwamitra is an example in this regard. As long as he was overwhelmed by his weaknesses like desire for opposite sex, anger, ego, jealousy,etc, he could not succeed in his attempts.