It's not that the soldiers will randomly turn against the public, it's that the tactics developed in building empire are also very good at subjugating the popul

It's not that the soldiers will randomly turn against the public, it's that the tactics developed in building empire are also very good at subjugating the population at home. Look at Germany in the late 1800's and early 1900's they tried to colonize a couple of regions in Africa,and developed military and social tactics to coerce and control indigenous populations. This colonization effort was largely a failure, and these same tactics turned against German citizens to seize and hold power.