Examples of evil behaviour can be a friend telling tales about their other friends, gossiping about their character or sharing their secrets in a malicious manner. Here they are inflicting harm by destroying their character of their friend or by breaching their trust. In order to understand a more destructive context, it should consider the most recent bombing incident in Manchester. This is a form of extremely evil and malicious intent where people were harmed or killed.
Now both examples of evil behaviour are harmful to the people, however, the extent of harm in the first one is different from the extent of harm in the second. Depending on the extent of harm, the evil behaviour will be dealt with. For instance, in the case of the first evil behaviour, schools could teach their students not to tell-tale or to gossip. This is because it is evil to the person they gossip about. In the case of terrorist incidents or any other form of intention to inflict bodily harm, there are law enforcements and regulations that are available in order to curb such evil behaviour. Hence, the effects of evil behaviour will determine the way it will be dealt with.
Evil behaviour is accompanied by malicious intent, false ideologies, exaggerated beliefs and even mental sickness. The effects of such evil behaviour hence have to be curbed by appropriate counter effects.
The situation considered here is one where I suspect without evidence that a friend of mine has committed a crime.
Now in this situation, the first thing that I will understand is the impact of the crime. If it is one that is ongoing and the effects and magnitude are beyond my control, then the first thing I would do is to report my friend. I would either approach a higher authority than me like our parents or the law enforcement. If the magnitude and impact of crime on others is high, then I will definitely not try to collect my own evidence. I will not even engage with my friend to seek information from him. I would probably want it to be sorted out officially. I would definitely tell the law enforcement officers that I have no evidence and that I have reported the crime on a doubt. I definitely would like my friends name cleared if he was not connected to the crime.
If the crime is something low key, even then it has to be reported. I would definitely approach my friend and ask him/her about the facts. I would advise them to own up to the crime in whatever way possible. They should either approach the person to whom the crime would have caused concerns or should approach the police or other authority that can report the crime or take up corrective actions. I would use my common sense, my good ethics and the best of my understanding of the law to advise my friend and ask him to own up to his crime. If he is not connected to the crime, I would get together with him and go and report the crime and the situation as it stands to the law enforcement.