First, I think your core point is true. We should hold those that wish to hold power to the highest ethical and moral standards. And given that the state cannot maintain those high standards shows the problems with trusting the state with those powers. I agree with that 100%.
But you lost me when you started trying to project motivation on why people join the military and to restrict it to three violent choices made it even sillier. I don't think this tangent added anything to your point and if anything will discourage veterans from listening to more podcasts.
While I cannot speak for others, I know that I did not join to rape or to kill. At the time, I was still at statist and as a believer in the volunteer army it was simply a duty that some had to take so that others didn't have to. So I did.
The vast majority of the people I served with joined for the GI Bill and not for any desire to commit violent acts. While they may not have been opposed to using violence, it was not a primary motivating factor as you want to project.
"We thought we knew everything about everything, and it turned out that there were unknown unknowns." - Richard Fisher, NASA 2009