You know what else is a good way to stop people being killed? Create a liberal democracy where people are equal. So far in history, that has kinda correlated... really strongly... with less people dying. There is both less war and less crime.

Um, if you want a society with less crime try Singapore or places like Shanghai. Hell, even Japan have much lower crime rates despite being more patriarchal then western liberal democracies.

Being "strong" in a meaningful way, in the modern world, means being intelligent. Smart people can use better rhetoric, invent cooler weapons, and solve your problems more easily.

Yes, and that will help you so much when someone tries to punch/rob/rape you.