Why does the argument presented below NOT prove the point being argued?
"Even though I saw the man lying on the ground, I did not try to help him. But I was not the only person there that didn't approach him to find out what was wrong. There were dozens of other people around, and they didn't do anything either."
A.We should not feel pity for the person on the ground. Maybe they were asleep.
B.Other people's actions do not prove the appropriateness of any one person's actions.
C.The person on the ground was likely personally attacked and we don't know if they deserved it
D. It was proven

Question

Why does the argument presented below NOT prove the point being argued? 
"Even though I saw the man lying on the ground, I did not try to help him. But I was not the only person there that didn't approach him to find out what was wrong. There were dozens of other people around, and they didn't do anything either."
A.We should not feel pity for the person on the ground. Maybe they were asleep.
B.Other people's actions do not prove the appropriateness of any one person's actions.
C.The person on the ground was likely personally attacked and we don't know if they deserved it
D. It was proven