i read your OP. and my question remains the same- why is it arbitrary that they are so high and decrease so slowly? as all PDS games (with CK2 as a sorta-kinda exception) take place from the governmental perspective; which naturally is much more acutely aware of situations than individual people; it makes sense that forgiving and forgetting takes a VERY long time. especially since governmental policy and perception reigns king in stellaris.
sure, you have a fair point regarding xenophobes, but that's about it.
That’s the problem. You see, in the real world, most people do not react the way it is depicted in the game. Through history, multiple instances of atrocities have been committed with a diverse array of consequences following said atrocities – on one planet, with one sentient species. It is especially true in cases where the countries we talk about have barely if any historical ties whatsoever. I let you entertain the idea now that we translate it about utterly foreign lifeforms, many lightyears away...
A lot of people in this thread, in game terms, would be part of the “Individualist” and/or “Xenophile” ethos and thus will find the act or even the mere thought of it as something despicable in and of itself. It is a bias they should start to acknowledge if we are to keep discussing this troubling aspect of the game. But pretending we are, as a species, consistent on that matter is laughable at best. The United States of America participated in some atrocities targeting the Natives on their soil for a long while, killing whole tribes, displacing them if nothing else, despite the fact they were supposed to be upholding human rights, to be some kind of “morale force”. The same can be said about Afro-Americans… Despite all that, in game terms, the United States were and would be considered “Individualist”, maybe even fanatically so, but not “Xenophile”. So, does it make sense for them to complain about others behaviour in light of their own actions ? Well, yes, it does. Morale, as many other things, is often used on the international scene as a way to project power. But the game has no way to show that, none whatsoever, and we are stuck with the really bad impression that all governments will communally find purging repulsive whereas in reality some government do not care or even find it, in some twisted way, a sign of strength.
Stellaris could do much better on the grand strategy side of thing by adding much needed depth in the diplomacy department, starting by tweaking the way we know what is happening inside the border of any empire at any given time and then have the possibility to create propaganda to influence the way other empires perceive other empires or our own empire.
There should be ways to control the flow of information and what is being said all around the galaxy, and especially what is being said inside your own borders by your own people, all the while other empires will try to get at your secrets through espionage.
There should be a greater emphasis on ethos and the way those will shape the way a nation will perceive the actions of others on the intergalactic scene, especially considering the fact some nations should not care one bit one way or the other for national reasons, with some ethos maybe approving or at least not caring about such actions depending circumstances.
There should be, to some degree, a modifier reflecting the idea of “might makes right”, as ugly as the idea appears to be, because it has some degree of truth to it. Thus, your overall strength in comparison with another empire should influence its diplomacy towards you.
There need to be something akin to Great Powers, like there are in Victoria II, Europa Universalis IV and Heart of Iron IV. Those are essentials if one wants to talk about politics and social movements.
There could be something akin to the Organisation of the United Nations, but slightly altered in its mechanics.
And many other things of the sort could be implemented.
With all this said, it is probably not something we will see in the next expansion ; they have many other things to do. But I hope, at some point, they will do an expansion focusing on politics, especially intergalactic politics. But until then, they need to seriously consider altering the numbers, if it is not done already, so purging is not necessarily perceived as an atrocity by everyone, everywhere, at the very second you decide to proceed with it, because it is just not, as sad this reality might be for some.