There's no evidence either way, that I recall, although it would be more 'Lawful Good' if Mengkare at least encouraged (if not necessarily mandated) fidelity and monogamy.
Shelyn doesn't care about such things, and she's indisputably NG and the literal Goddess of Love. So...I'd say the evidence is pretty strong that caring about monogamy per se is basically Lawful rather than Good.
You're right that there's no evidence either way regarding him caring, of course, I'm just arguing interpretation.
Indeed, it might actually be evidence that he's shifting away from LG, and more concerned about the end-goal, if he's got a more relaxed view on things like marriage and multiple partners (or literally doesn't care at all, so long as children are produced according to the plan, much like the old Biblical tradition of marriage in which it was okay to have multiple wives and 300 concubines, so long as you didn't knock up any of the concubines and mess up lines of succession / inheritance, as King David did), indicating that he's less interested in moral issues or long-term stability / emotional health of relationships.
Well, long-term stability is, again, more of a Lawful goal than a Good one, and being trapped in loveless marriages and forcibly kept away from those you love is pretty harshly non-Good, IMO. While allowing people freedom to find love is pretty much the definition of Good in a lot of ways.
So I disagree. If you have to marry and have kids with who you're told (and you do in Hermea) then it's borderline Evil to make you also not pursue a relationship that could actually make you happy, and Good to generally allow such things without stigma.Unlike our world, good and evil are measurable quantifiable things in Golarion, not at all subjective or subject to change as society evolves, and have mechanical effects (such as spell interactions).
This is true, and the fact that Shelyn agrees with my views on relationships mentioned above thus means I'm probably right within Golarion. :)
It's unlikely, in Golarion, that anyone could be confused as to whether or not what Mengkare is up to is good or evil, since these things are as mechanically set down in Golarion as the laws of gravity or combustion. We can have debates about morality and ethics all the live long day, because they are abstractions, whose definitions change across time and cultural divides, but alignment in Golarion is a descriptor, with mechanical effects, like fire or electricity.
This is, I think, incorrect. Alignment is objective and verifiable, but it actually requires pretty advanced instrumentation (you need a phyalctery of faithfulness and nine cooperative atheists who are each verified to be of a separate alignment to properly and scientifically answer any one question about it...you can then go on to answer lots more, but this is tricky to arrange) to actually make definitive statements about it, and then there's all the magic to conceal alignment, and the fact that it's not most people's primary area of study, and you get widespread ignorance about a lot of the details.
Really, I tend to think of it in the same category as advanced physics is in, in our world. There certainly are people in the world who understand much of the theory, but they're quite rare and their explanations may not make a lot of sense to a layperson. There are a lot more people (like most Paladins) who have a good intuitive understanding of the practical side of things, but without knowledge of the theory, their preconceptions can lead them astray.
So, no, I don't think most people know in-world. Especially since only people in Hermea could have the necessary information to make such a supposition with any hope of the myths surrounding it not getting in the way. There's also the whole motivation component. Something can be a Neutral act and be perpetrated by both Evil and Good characters for very different reasons...I suspect a lot of what most governments do falls under that umbrella, making it even harder to judge without using alignment detection on the Dragon himself, something he could easily have a way or three around.