Please analyze the tweet "#IfOnlyPeopleWould not exist. #humanity #life #ignorance #nature #mothernature #sad #disappointment #smh #personal #opinion #views #animals" and classify its emotional content. Choose from the following emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If no emotions are detected, respond with "neutral or no emotion".