Catfish

I believe that "catfish" are a necessity for people to stay alert and focused, because otherwise we would get complacent. While the term means someone who pretends to be someone else I also believe the quote they have at the movie also relates to things that motivate us to not get complacent. Like some people may have kids and their kids drive them to always get better and do better for the kids. I believe the urban dictionary word catfish means things that may drive us to get things done that we would otherwise push away and not complete.
In my life I believe that the catfish in my life is not someone but things like school academically, in sports competitively, and friends. Without these things I may get complacent and not strive to accomplish goals or even set goals for that matter. This brings me to this point, that catfish whether it is a person or an idea/thought, it causes people to set goals and always strive to be accomplished.
So yes, catfish are a necessity for people because without it/them people may not set goals for themselves or be focused.