In some cases, individual support for justice may be unbearable.
This degree is really difficult to master. Let the child have a sense of justice, maybe he will face danger, maybe he will get hurt. What we need to do is not to choke on food for fear of danger and injury, but to teach children not to lose justice while protecting themselves and to teach them to use wisdom and intelligence. It is not a strong individual heroism for a while, but a collective force that uses resources in different times.
Therefore, when supporting justice needs to face great risks, we can adopt some flexible methods to protect our own security and major interests as much as possible. For example, when you see a bad guy with a murder weapon doing something bad, you can choose to call the police instead of rushing at him directly.
Tell him that justice is a motto to restrain oneself, not a moral sword to kidnap others. If personal safety is not harmed, justice will be maintained. Even if others are using you unfairly, you should fight back in a fair way.
When your life is in danger, you are more evil than the bad guys. If you can't be more evil than the bad guys, you should try to ask for help. At this time, the best way to ask others for help is to bring them in, which means hurting others' interests, so you can't use a just way.