According to Buddhist beliefs, our life is like a dream. When we are dreaming, we experience the dream as real and within the dream, we can be happy and we can also suffer. However, from the moment that we wake up, there is no way that we can prove to others the things and experiences of our dreams, which seemed so real. Actually, we are the only ones who experienced the dream.
This perspective should also lead us to not judge others based on appearances. For example, the appearances of animals are the results of their past actions and so they may look friendly or frightening, but actually inside have a different experience. So, I believe, it is wisest to reserve our judgments and comments about others, after all we already have enough burdens and worries to take care of.