[fiblye]

That’s not the point of defamation laws. If someone assaults you and you post a video on twitter, most first world countries will use that as evidence against the person who assaulted you. In Japan, it’s perfectly legal to record someone, but making the fact that the person is dangerous and not in police custody will get you in trouble, and the person who assaulted you will use the video against you. Defamation is generally globally defined to be false statements made with the intent to harm someone’s reputation. In Japan, full context, factual representations are treated as just about as bad as a false claim.