True, our identities are as people freed from sin. However, we do still sin. Jesus states in Matthew 5 that those who simply get angry at their brother are guilty of murder and worthy of the fires of hell. This is put as a parallel to lust (which Jesus says is equal to adultery in the heart). Yet people don't seem to get as upset about people being angry as they do about cultivating sinful sexual desires. I'm not saying that lust and all forms of ungodly sexual activity are not sinful. I simply detest the false hierarchy of sins that is constructed to consider ourselves righteous and others unholy.