Human beings and animals are both different species.Applying animal specific use cases to human beings have done a lot of damage to human thoughts.
Animals are a prerequisite for human evolution and that purpose has been acheived.
Now human beings need to understand themselves and know human behaviour which is not going to be coming from just animals.
The lion and the deer coexist to have a balance in nature. They are simply playing their role in existence and help each other in continuing to exist.
Human beings have imagination and they can keep thinking of anything and make their perception a reality that may not actually exist.
In the lion killing the deer there is nothing wrong. You can never find lions killing deer for fun or sport or revenge it is just hunger. Only the weak sick and feeble deer that get removed to make way for more to come.
But look at human beings and their behaviour. All over the internet we find now causes bringing out true human behaviour of love compassion empathy Justice and universal coexistence.
Let us all work to quicken the pace of one human society living in peace and harmony among themselves and with nature.