You have this idea that the Japanese military will become a runaway juggernaut subjugating Japan under its will, and this is simply ridiculous. No signs point to it.
I could almost accuse you of fear mongering
Also, your accusation that most Japanese are "very uneducated when it comes to politics/history" is anecdotal and incomplete at best, comically reductive at worst. Do you even read Japanese? Do you not see the amount of considered, deep analysis and discussion on TV and in the newspapers? Do you not see the huge numbers of books on history in the bookshops?
In any case, it is ridiculous to claim that "most" (or even some) Japanese people live in fear of the SDF. You'd be laughed out of the room for claiming that in front of anyone with even a passing knowledge of Japan.