Molyneux presents in this book his secular theory of ethics, for what we should and should not do. In his own way of writing, that I’m not too fond of(the paragraphs!!), he manages to put forth the theory in a systematic manner. As most systematic theories, they are pretty boring to read with the occasional good and important parts. I felt that some parts of the argument were a bit muddled, and the same kind of ambiguity in the argument made the read somewhat harder to follow. Part 1 did, however, do a decent job of presenting the theory.
An example from the chapter on murder in part 2. The claim is that murder is not universally preferable because for it to be, two persons must be able to murder each other. I see some soundness in it(based on the first part), but there is also the problem that universally preferable behavior is not something that we do all the time at the same time(yes, we avoid murder if we do not do it, but it is not behavior - it is the lack of the behavior, and UPB is mostly about not doing bad things than doing good things). So if murder was good, and one did it, it does not make the other's loss of the ability to murder necessarily make murder bad. Just like a natural death makes the dead man unable to act in respect of others property - because he is unable to do the respecting(for that, he needs to be alive). This is why part 2 seems to consist only of UPB’s in negative - the lack of bad behavior, that is Universally Avoidable Behavior - a more fitting name for the theory? It seems at least more of a “Don’t do unto others...” than a “Do unto others...” kind of theory. For oneself, it seems to embrace “Be truthful” rather than “Avoid being deceitful”, but "Be truthful" is not a very clear thing.
Still, there is an argument in there that seem correct in the whole, but all this negating approach makes it frustrating to read and sometimes to follow. Just like an endless string of double negatives, one gets too dizzy to care. Some of it just feels like an unnecessary complication, even though I’m in agreement. Because of that, I don’t think the theory, sadly, is going to have a wide impact. It seems more of a complex framework of ranking behavior on a scale rather than a more clear theory of good action. It could have done with better writing, but this was enough to appreciate the value of the theory and get a glimpse into the processes that guide the mind of the author.