You are making a claim, probably similar to "I scraped my knee badly and it was fine, so how can someone scrape their knee in a similar way and be in agony?" Y

You are making a claim, probably similar to "I scraped my knee badly and it was fine, so how can someone scrape their knee in a similar way and be in agony?" You are making assumptions that pain is objective, not subjective. A knee physically scraped in the same way will have the same levels of pain. I don't see any reason to believe that. I could easily see the same injury on two different people resulting in different levels of pain. I could also see a kid who's parents pushed them off a bike in an act of abuse resulting in a knee scrape re-experiencing the emotional trauma of the abuse through the physical pain of the knee. I could also see an injury in the same spot over time turn into something debilitating. I don't deny that there are people who take advantages of bad sets of incentives, but there are also people who aren't taken seriously because people look at the incentives involved and say they must be faking it. I don't think it's just to punish the innocent along with the guilty.