We can help people if we want but we have no right to insist on their help or to force others to be charitable

There is no reason to force someone to do something they do not want to do, or to prevent them from doing something that harms no one but themselves. If people do not want to pay taxes, there is no reason to force them.

An action cannot be criminal if we must be informed of our obligations in advance. Theft is still a crime even if we do not realise that it is wrong. Then, failure to perform positive actions cannot be a crime because, unless we know about it we cannot be expected to comply. It cannot be a crime if ignorance, or forgetfulness is a viable excuse. It doesn't matter if we forget that assault is against the law, it remains harmful.

The reasons against natural law crimes are based in reality, it would be to deny reality to fail to see that other people do not want to be the victim of crime. But it is not denying reality to be ignorant of the reasons to be obliged to make a positive act, in this case the criminal is the accuser who relies upon myth.