That's the point though. If you're not a slaver or a xenophobe, then using nerve stapling is akin to an exploit to bypass the ban on slavery. Nerve stapled pops, whether the game treats them as such or not, are slaves. They are not trading work time for leisure time. They cannot have leisure because you labotomized them. All they do is work. This makes you a slaver.
Yes, it would be cool if the game had dynamic ethics which shifted based on your choices. Make slaver and xenophobe choices, piss off your egalitarian and xenophile factions as your government ethics shift more and more to those "evil axes". But the game does NOT have this kind of mechanic rewarding you for leaning into the roleplay of your chosen ethics and punishing you and dropping you from the ethics you broke.
So for now, the game has to give you binary choices: either you're a slaver or xenophobe and you get to commit the atrocity of nerve stapling pops, OR you're not and you don't get to.
Mostly agreed, but too complicated. I think nerve stapling should just be treated as a Purge. Anyone who can Purge can nerve staple. Anyone who is salty about purging should be salty about nerve stapling.
Also the nerve stapled people are not slaves, they are braindead. Dumber than the literal zombies.
Keep in mind that a Droid has more intellectual capacity than a nerve stapled person.
Which is another issue. Stellaris hierarchy of sapience goes:
1. organic people and synths (any job)
2. droids (any job except scientist)
3. robots and nerve stapled (workers only = miner / farmer / nuclear reactor operator / servant / special factory (planetary feature))
4. presapients (can not work)
Yet for some reason the nerve stapled are considered still people... they are just "people" who cannot work in any specialist job. just like a simple robot. nerve stapled should at the very least should be droid equivalent and be able to work all non leadership jobs. but ideally they should be able to work all jobs. Heck they should even be better as leaders due to no corruption. Unless it is meant to be a literal lobotomy instead of an incredibly sophisticated feat of genetic engineering that requires a literal bio ascension to unlock and the lore says is just removing unnecessary desires.