Is Fear Our Worst Enemy?

I believe that fear can both be a friend to humans and also an enemy. Fear is among one of the greatest motivations including: hatred, revenge, love, and power (in my opinion/experience). All of them can urge people to do things, either wonderful or terrific, that they never thought they could accomplish. However, that can be both a good and a bad thing. If any of these motives were used to do something destructive to others or oneself, then they are definitely not our friends. For example, threatening someone to do something is using fear against that person. Sometimes, when you combine the motives, the effects may be even bigger, like threatening the lives of that person's loved ones. They, however, can also be used to motivate someone to do good. Like sacrificing themselves because of love or getting a good grade out of fear. However, fear is not a good motivator and should be used as little as possible. It should only be used to help us, not control us. If you let fear control you, then that makes you very vulnerable not only to your own fear but also to others who may turn your fear against you.