People tend to change based on their environment and the things related to them.
You can be a gang member but still have the heart for animals but if society knew that you liked them as a gang member, you would be ridiculed. It is the fact that most people hide who they truly are because they are afraid of rejection and everything that could happen. You hide certain parts of yourself for fear of being hated.
If everyone in the world were completely open about everything in their lives, there would be a lot less hate and a lot less rejection in society.