Not sure if this has been suggested by anyone in the thread, but I think a possible reworking of what ethics allow what form of purge would be very useful in 1.5
For example, I believe Militarists should have limited abilities to displace or purge undesirable pops and I'd go as far as to say that certain forms of purging should be locked into fanatic ethic types. i.e a fanatic Xenophobe can basically do anything to any Xeno Pop, the natural draw back of which is using two ethic points and also likely making any diplomacy with xenos impossible. By the same logic, Fanatic Authoritarians should be able to purge, work pops to death, displace etc. Though I'd reserve livestock and processing for Fanatic Xenophobes, or Xenophobes depending on the balance.
For regular Ethics, I'd give Authoritarians the ability to displace pops or work them to death, perhaps to directly purge, but those details can be worked out. I'd give Militarists the ability to displace, again depending on balance this could easily be adjusted and Fanatic Militarists the ability to purge, labour camps and displace. While it seems unlikely to be possible, it would be interesting if some of these could also then be tied into having a combination of ethics, such as for example, if you are Xenophobic, fanatic Militarists you could be given the ability to use any form of purge, despite lacking the fanatic Xenophobe trait.
It would be interesting to see if Authority could also work into this. I imagine that it's more difficult to purge pops with a democratic authority, though fanatic Xenophobe democracies should logically be fine with purging Xenos, but I'd go as far as saying that some of the more Totalitarian Empires should get more options for purging, but still get the malices for non-Xenophic, non-Authoritarian pops.
Perhaps they could try and work out a system which also allows you to purge certain ethics from your empires as well. For example, perhaps Xenophiles or Pacifists could be granted very limited abilities to displace or remove Fanatic Militarists or Fanatic Xenophobe pops or something similar, even if it goes against their core ethics, the Fanatics could be viewed as too great a threat and leaving them to threaten your other pops could be a greater evil than removing them.
Anyway all of this is just theoretical ramblings, and we'll see what the 1.5 system is when it comes out.
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