They got a monarchy. That means something. The monarchy serves as a kind of sacred cultural identity and attacking the monarchy is like attacking the society itself.

Places like England have more evolved monarchies, where saying something against royals won't land someone in jail, but the same sentiment is there. The only way to "dismantle it" is to wait and do it in steps over generations. Even Thailand is doing that now. The royals are largely symbolic and don't exercise direct political power. But there's still a strong cultural attachment.