Kindness is contagious. In social psychology, there is a concept called the behavior transmission effect, where the kindness one receives is more likely to be transformed into kindness towards others. For example, if you are treated kindly by a driver today, you are more likely to help someone hold the door in the next moment; and the person you hold the door for will also have a better attitude towards the delivery person. Kindness thus quietly spreads between people. But if we amplify malice, we will find that it also follows this transmission effect. In a healthy society, more and more people will be kind; whereas in an environment filled with malice, everyone will become guarded, and some may even start to avoid kindness.