Analysis of Innocence of Mockingbirds

Mockingbird, mockingbird sitting in a tree
I look up at you; you look down at me
I whistle a tune; you sing it back
Then change it yourself into a mockingbird's tune
A tune filled with sorrow and happiness
Only an innocent mockingbird
Mockingbird's tune could do that.

Mockingbird, mockingbird now I understand
You sing for us humans and are our angels
To guide us in life
Or help us along
Lifting our spirits
With a sweet little song
So innocent you are
You and all the other mockingbirds
It should be a crime to kill such innocence
What an angel, whatever we ask
You do without anything in return
Everyone should have a mockingbird role-model
For it is a sin to kill a mockingbird.