Hi Anon
Thanks for your reply and sorry to take so long to respond.
This came from comparing various relevant Sutta and Vinaya texts, as the Buddha is recorded to have said ‘the sutta (dhamma) and vinaya will be your teacher when I’m gone’.
For Vinaya you might know the Four Parājika, the first four rules for the monks. The serious Parājika are more specific than the first four of the modern 5 Precepts and the Vinaya says the serious rules (unclear if it means just Parajika or also the 13 Sanghadisesa, but the second group does not apply to laypeople anyway) cover Ethics (Sīla), and the other minor rules cover good habits (ācāra). Avoidng killing beings other than human is in the other classes of faults, grouped under minor rules.
The Vinaya tries to determine what the serious version of stealing would be and the general attitude seems to be stealing something of great value, e.g. not just a plastic biro. If it meant stealing the means for someone to support themselves, then that would be akin to killing and make sense to me as a serious action. Also sealing other minor things is covered by other minor rules in the Vinaya.
The Parajika are also specific when it comes to sexual action, as you would know. In this regard it is a monk having sex with a woman. Other types of action are in the lessor category of rules.
Also it is specifically fraud in the Parajika, and even more specific, spiritual fraud. I read this in the context of monastic life, and it would be done for physical gains. I think the general idea of fraud also applies to lay people and they would do it also for physical gain, often resulting in the loss of livelihood for another, i.e. doing one out of a great wealth. Lessor types of stealing are covered in other less serious monastic rules.
Whether serious or minor, all are wrong action, but as I understand it, it is only breaking serious rules, which means breaking ethics, which will hinder one on the path. This distinction seems to be lost in Early Buddhism and Theravada. This matches with sutta verses that say a noble one will be cleared of minor infringements, since they have fulfilled the essentials of the holy life (in this case ethics/sīla, in my opinion).
For Sutta texts:
We have the Sigolavada Sutta, which talks about four Vices of Conduct (kamma kilesa) and the next action is obviously of a different category: intoxication which leads to wasting wealth. Thus in the Vinaya, we also find drinking alcohol as in the minor category of rules, not the Parajika (or sanghadisesa).
Rape and pedophilia would be classed under the explanation of wrong sexual conduct in the sutta which was addressed to a layperson: MN 114.
So, if one reads the consistent Suttas and Vinaya texts, it seems that the modern 5 Precepts for the laypeople are a more difficult or higher standard than the Vinaya for the monks. That’s the main reason I don’t accept the modern interpretation of the 5 Precepts. Rather I see they originally had two categories, like the Vinaya and only the first serious category was about Ethics.
I think the original 5th Precept was as found in the Kalama Sutta, which directly brought a social dimension into the training, the lack of which was an early criticism of the Mahayana. The Kalama Sutta seems to say the 5th Precept was: avoiding leading others into those four serious just mentioned actions.
My main study covering these points with relevant references is:
best wishes
Joe