try not to die or you lose all your weapons

When we were younger and I was starting the study of history my brother asked me the two great historical questions.
1) Why didn't all of the slaves revolt (specifically in the Southern US)?

2) Why did so many soldiers volunteer to fight in war (specifically the European Wars)?

I know the common answers.
1) Why didn't all of the slaves revolt (specifically in the Southern US)?
-most people cannot move against the current of their culture
-slaves did revolt in small pockets, lacking the resources to unite their struggles

2) Why did so many soldiers volunteer to fight in war (specifically the European Wars)?
-Romantic perceptions of war
-conscription

I still don't find them satisfactory.