@Didymos Thomas,
Morality is riddled with fallacy, if law is founded upon morality then it is sure to disrupt what would otherwise be a free society. Law should operate with regard to empiricism - what doesn't work for a positive beneficial society, what hurts people - if we found law upon common moral codes then we fall into the trap of multi-billion corporate profit being legal; everybody thinks it is just to make as much money as possible as long as nobody is harmed or treated in a derogatory fashion along the way, yet many corporations treat people like dirt yet they treat them within a law which is founded in morals, usually morals founded in religious doctrine.
Surely our society would operate in a more just fashion if there were laws forcing the rich to donate money, yet religious morality doesn't acount for financial inequality, it accounts for such silliness as disobedience or adultery.
Sure theft or murder should be illegal, although law doesn't stop the government from thieving and killing, law should stop people from doing so because it harms others. When you see the inequalities in a system founded in sheer religious subjugation then you realise that the biggest criminals in this society operate within the law.
For me the word 'justice' bears no relation to morality, it relates to pain, discomfort, hardship and to forcing those who do not consent. Sure you could outline a moral argument against these things and make a good job of it, but when we talk about injustice some morally acceptable actions could be considered unjust and some immoral actions could be considered just. Lets take an example of a prostitute; she's not drug addicted, she lives in a nice house and she has friends outside of the sex trade, for many people any kind of prostitution is immoral because engaging in it encourages society to engage in the less decent sides to prostitution; morally we have to live in a society governed by 'correct' answers to social questions. It is my opinion that sleeping with the higher class prostitute is just, and sleeping with the drug-addicted prostitute is unjust - surely law could allow for such discrepancies, if only it were founded in empiricism and not morals.
On the other hand it would appear to be acceptable, although perhaps not morally, to target children with addictive damaging substances such as sugar, caffeine, fats and salt. However, it seems that no religion has accounted in their moral codes for billion dollar corporations following the laws of the land and damaging the children of this society - blatantly unjust yet accepted by the governments, they might pass pithy laws banning sugar adverts on Cartoon Network, but we all know that Coca-Cola has a hold on this society's desire; through sneaky marketing and steadfast branding, they could sell a 5 year old a bottle of Dr Pepper through his older brother or his mother or his gran.
I might sound like a militant crazy person, dont get me wrong I used to love going wild on sugar rushes as a child, I'd never deny such experiences to children, but they shouldn't be targetted, and having Santa Claus in an advert is surely targetting children.
There we go, rant over... but it was sincere, and I wholeheartedly believe that the point I'm making is real secular justice.