As I said before, I see the parallels to the Japanese Emperor in the 1930's. Hirohito wasn't particularly interested in expanding Japanese territory or going to war with the major European powers, but he had to tread carefully because the real power lay with the military. And even the military leaders had to tread carefully because the *real* power, the folks who were likely to kill you for saying "Maybe we should think twice about this" were the junior officer cadre. As in the 2-26 Incident, where a group of junior officers tried to assassinate most of the civilian government and several of the more democratic-leaning senior officers.
Like Turkey and Pakistan, Thailand has a checkered history as far as both military and civilian rule are concerned. They've been under military rule for most of their modern history (certainly since becoming Thailand instead of Siam).
1932-1946: Military government (with young king in exile)
1946-1947: Civilian government
1947-1973: Military government
1973: Student-led democratic protests. King sides with the protesters, criticizes the military for their handling of the protests. Military PM resigns, is replaced with a civilian PM.
1973-1976: Unstable democracy which quickly veered to the Left, while the middle class stayed conservative. Military takes over in a coup (with US blessing).
1976-1992: Military government
1992-2006: Civilian government
2006-2007: Military coup
2007-2008: Civilian government
2008-current: Military government
As you can see, the period of civilian government from 1992-2006 was actually the longest period of civilian rule in modern Thai history.
It kind of follows the trend of a lot of Southeast Asian and Latin American countries in the 20th century -- conservative royal/military rule gives way to democracy, but the leaders of the democracy go too far to the Left too fast, freak out the military (and after 1945, the military's ally in the US), and the military steps in to prevent "the spread of Communism".
In the modern post-Cold War era, the pretext has been political corruption rather than rampant Leftism. And, as in Turkey and Pakistan, it's not a total fabrication -- Thaksin Shinawat's government *was* corrupt as hell. He even had an anti-drug campaign not dissimilar to Duerte's in that thousands of extra-judicial killings too place as a result.