Kids are brutal because they have no filter. They ask grandma why she has a moustache. They ask little people why they’re short and wonder out loud what happened to the person who is in a wheelchair. Generally, they don’t say these things because they’re malicious; they do them because they’re curious about the world. Children also have no idea what’s acceptable and what isn’t. At some point in life, children begin to grasp the concept that there are things you can ask and things you should leave unsaid. Back in the day, this was usually communicated with “Billy! If you can’t say anything nice…” and Billy would finish the sentence: “Don’t say anything at all.”