He's only slightly unstable, and wealth can buy him out of that. If not, there's always an iron fist or simply appeasement, its hardly as if the nation is full of criminal circles planning to kill the king and usurp his throne. And seeing how its a democracy, its pretty much a given that its going to have some instability .

Just noticed how much the map looks like a butchered GB. The only real difference is scotlands been maimed and there's an extra bit sticking out xD