Is evil inherent in human nature? That is, are some people just "born evil," or is evil caused by circumstance or environment?
My Opinion: People are not just born evil, but if repeatedly exposed to negative circumstances and environments it will eventually become part of the way they behave.
The pictures above show how Gru was a normal child with no evil traits. Then as he got older he was exposed to negative things which turned him into a villain. In the last picture Gru has been influenced by positivity (the three girls) which returned him to the nice person he was in the beginning.