The laws have not been exactly "wiped out". Fulfilled would be nearer the mark. The specific laws are no longer the means of salvation, but the principles of the laws are still in effect. For example, while growing up, I would be beaten if I hit my sister. Which I did, now and then. I am no longer beaten for hitting my sister. However, the theory is that after all these years of earthly laws and physical punishments, I have stopped hitting her.
Though I don't know about keltic63's humanity stuff. I would think it would be better to err on the side of the law, due to the fact that humanity is corrupt and wicked and incapable of independently acting rightly.