Though, they do make lots of violence-themed sets anyway ... pirates, star-wars and then their new in-house themes ninja-go and nexus knights and many others. I believe they have moved the goalposts slightly. Any public stock holding company tend to move in the direction that will maximalize share holders gains, and if kids (and parents) wants violent games, they will have it.
RE: Why Lego Company Won't Ever Make Military-Related Toys