The answer is: To emphasize the horror of what has happened.
Silent Spring is an environmental book written by Rachel Carson in 1962. She focused her attention on environmental problems specially the ones caused by synthetic pesticides. Carlson wrote the book after researching to make American people aware of the problems they were facing. Even though it had opposition from the chemical companies, it brought about important changes.
Based on my own knowledge, Tank Man was the standpoint of silence and defiance, an act of rebellion against the Chinese military. One of the most iconic pictures ever taken in the 20th century, the legacy of Tank Man remained in tact as the 'aggression' against the government.
The events leading up to this incident was a major catalyst, as the government cracked down on violent Chinese protests, and no other could be brave enough to stand in front of militarist machinery.
"Are you going near the post office?" Mrs. Ried asked her husband. "Yes," he said "is there anything you want?" "Could you get me a small resgisetred envelope please?" Mr. Reid said, "I've got to send some money for my sister in Guyana." Mrs. Reid said. "I'll get a couple it may be useful to have a spare available."
