The Leadership of Auradon is incompetent

1. Barely any security at a museum protecting literal magic objects
2. Allowing a new girl who spelled the king to remain at court, and then get spelled again by another one
3. Allowing the King to go to the isle of the lost practically unsupervised and almost get killed
4. Not putting proper precautions to ensure the barrier won’t stay closed
5. Fairy Godmother can’t put a spell on a villain effectively
6. Allowing mass unchecked immigration of a known dangerous population
7. Bringing back said dangerous population from the dead in the first place
8. Making a 16 year old king
9. No soldiers to stop Queen of Hearts
10. No magic or anti-magic defenses against Maleficent, Uma, Audrey, QOH.
11. Imposing the will of one King over a regional Queen(Leah) without consulting her, leaving the other Kings and Queens in Auradon only ceremonial A revolt could happen in a couple of those kingdoms
12. Horrific conditions on the isle of the lost

It’s only a matter of time before a revolt or invasion happens, realistically. If the events of the three movies really happened, there would very likely be many people calling for King Ben’s immediate removal for his overly lenient policies.