system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars/Sci-fi General] Deadliness of the First Order Stormtroopers

[This may be the wrong sub to ask this question but....] 

In *The Force Awakens* the First Order steals kids from their families and trains them to be soldiers in the First Order army, the idea being that the kids will have unquestionable loyalty to the First Order and will be deadlier than the average soldier.  And in a lot of Sci-fi, there's the idea that a kid trained from birth to be a soldier will be highly effective at their tasks. 

But you're going to be completely caring for this kid until *at the earliest* they start puberty before you start recouping your investment.  And from what I've heard, these "raised from birth" soldiers are often killed by run-of-the-mill volunteer soldiers, so what exactly is being gained from training kids from birth to kill?
gpt
Social conditioning. Even the best trained soldier can suffer a breakdown, because ultimately, humans aren't particularly violent. Training a soldier requires conditioning them to ignore instinctual responses and do something that is A: against their self-interest and B: against their wider social programming. 

By raising children in a conditioning environment, you can avoid the second issue. You don't have to worry about then being taught that killing is wrong, because you control the lessons. It's not going to necessarily make a better soldier, but it is likely to make a more controlable one.