I notice you have a table collecting and assessing possible harms from the practice but no similar table collecting and assessing possible benefits. In deciding whether to fight against some practice shouldn't we want to figure out the net effect - benefits minus costs - rather than just costs?Given how widespread the social phenomenon is, surely there must be some benefits?( Something something Chesterton's fence...)Near as I can tell, the people who think it's terrible are in large part motivated by largely-false quasi-Mathusian claims related to "overpopulation". If we set those aside, younger brides tend to have more kids; all else being equal we should assume those kids have lots of extra QALYs (that wouldn't otherwise exist) and also presumably make their parents happy. Are those married as children happier adults on average than those not? How do we balance a claimed higher risk of physical abuse against, say, a lower risk of ending up childless or alone or financially insecure?
If your goal is to make the world a better place, just making the list available seems like the most Effective and Altruistic way of doing that, no? Software developers tend to be way too afraid somebody will "steal their ideas" as the best ideas are HARD to popularize. Nobody but you sees as much value in YOUR ideas as they do in their OWN ideas. In practice, good ideas are cheap; what matters most is following through with implementation (and being lucky and having good timing...)
Keeping your ideas secret might prevent other people from stealing them but also prevents other people from IMPROVING them. Or sometimes even HEARING ABOUT them.