I was thinking, we should have some more worldview buildings (slavery / cannibalism / human sacrifice) for the industrial era and beyond. In the real world they would be ideas that have either been tried only on a small scale, or only in fiction. I had some broad ideas below:
Eugenics: Guided (or forced) breeding of humans to produce superior offspring and reduce or eliminate both genetic defects and 'undesirable' traits.
Since this would create a modern day caste system, I'm thinking it would boost the output of specialists (+

for scientists, +

for engineers, etc.) but without reducing the GP rate. Instead, it would increase

, increase national revolutionary sentiment, and make non-eugenics leaders dislike you more.
Organ Harvesting: Convicts, POW's, and randomly chosen citizens are executed and their organs harvested to replace failed ones in wealthy, powerful, or otherwise 'important' people.
With successful people living longer, there would be an overall boost to output in cities (+%

, +%

, etc.) but a reduction in growth rate and an increase in national revolutionary sentiment and

since alot of people are being killed, plus non-organ harvesting leaders would dislike you more.
Human Experimentation: There are fewer compunctions (or none at all) about performing dangerous experiments on human beings in the pursuit of scientific advances.
With no rules regarding what is and isn't acceptable in medical research, doctors can be trained faster, new drugs can be tested on people right away, and diseases could be studied and cured more quickly by deliberately exposing healthy people to see how they respond. This would boost +%

and reduce the disease rate, but increase

, increase national revolutionary sentiment, and make non-human experimentation leaders dislike you more.
Martyrdom: The view that it is a noble thing to sacrifice yourself for the good of others.
If a society can freely ask it's members to die for the greater good, then widespread euthanasia would eliminate 'non-productive' members of society and suicide bombers and kamikaze planes would become regular military tools. This would increase +%

and decrease -%

, increase national revolutionary sentiment, and make non-martyrdom leaders dislike you more. Additionally, you would get access to less expensive versions of infantry and aircraft that start with kamikaze type promotions (no need to train or equip them fully if you know right from the start they are only going on one mission) and a cheap espionage unit that only has one mission: sacrifice the unit to destroy a random building in a city or a tile improvement.