I don't know why, but one of her little ears was cut off at the tip, I don't understand why they did that to her, I always wonder how can people in this world be so bad?

Here it is done to stray cats are are sterilized. So that people who take care of that know only by looking at the cat. It is a way to prevent them from breeding uncontrollably.
It doesn't looks nice, but it not out of meanness.