Life according to Freeman #2

The 3 wise monkey
🙈 see no evil
🙉 hear no evil
🙊 speak no evil

Sometime there’s the fourth monkey depicted.
🐒 do no evil.

My question is, why is there not the fifth monkey. I believe there should be, and it is the most important of all the monkey.
It’s because we deliberately or knowingly left the most important monkey out. Or is it because we can not possibly achieve to be the fifth monkey.

🐵. Think no evil.

Are we all as human, in one way or another must possess an evil thought.