Got to run so can't explain fully ....
In shorthand, we can all guess at what the real intentions are of different military forces are. Some of those guesses might be more reliable, might be more informed than others, but they are still guesses and therefore lend themselves to uncertainty. There are only a few very short steps between uncertainty and fear.
Thus on the basis that we can never be certain what militaries are planning nor what they regard as security or insecurity, and therefore on the basis that we can't or don't know their intentions, the proposal to demilitarise is essentially one that takes away the capacity of the militaries to implement their otherwise mysterious intentions.
Demilitarisation is often the best way forward precisely where there is a massive assymetry in power. .... but this is a longer story .... got to go ..