The fisherman really wanted to help the cups to climb over the boat but they were afraid. Because yes they were little babies of a bear, but still they were wild animals. What if they attack them thinking them as a danger?
One of the man in boat, Ruslan Lukanin’s said- “it was dangerous of course, but they are living creatures we couldn’t just look the other way”. Hence, a pure heart will always be pure no matter what.