What was the human thinking about the organisms the earth at the time of launching Pioneer-10? What measures were taken for protection from this imaginary problem?

At the time of the launch of Pioneer-10 scientists thought rather suffered from the fear that the civilization of outer space might attack the Earth as it becomes angry due to some mistakes committed by them. Pioneer-10 had to go out of our solar system passing through Jupiter. Developed civilizations could counterattack Earth assuming it as an attack by human civilization. To remove this misunderstanding human male and female were drawn in friendship gesture on a plate attached to Pioneer-10 and it was shown in the sign language that this spacecraft has been sent from Earth.

The plate attached to Pioneer-10 to send a peace message to aliens.