Why should vegetarians use soy protein?

Many vegetarians and vegans have fallen susceptible to a loud voice in the public sphere that tells us people need meat for protein. The message is that plants do not contain enough, but this is not the case. Plants contain protein too and it turns out the be the perfect about that our bodies require. Someone can eat nothing but potatoes and fulfill their bodies requirements for protein. As a vegetarian of 19 years, I too fell into this myth and for a while consumed a lot of protein alternatives such as tofu and tempeh. But the more I have researched and experimented with my diet over the years I have come to find that fruits and vegetables contain complete protein and I have no craving or desire for these more artificial sources.