Omega 3 and Omega 6 are polyunsaturated fats. They are called essential not because you need them for survival but because your body cannot make them.
The misconception above is used by vegetable oil manufacturer to promote their poisonous products, like canola oil.
Humans have evolved to eat organic animal fat (Saturated and Mono-saturated) not polyunsaturates.
Source: Omega 3 & Omega 6 (polyunsaturated) fats explained