Why do non-fighters think they know how to fight?

Why does the average human male believe he is 9000% more effective in a fight than he actually is even with zero training?

Ramsey Dewey,MMA,fight,fighter,fighting,mixed,martial arts,boxing,muay thai,BJJ,wrestling,spar,sparring,kick,kickboxing,know,effective,wong,novice,beginner,sanda,kungfu,tkd,jiu-jitsu,ufc,