Royals have been unbannable for years, maybe even since before I joined BM almost 8 years ago... Why would it suddenly become a problem overnight? You should always make sure you care able to keep a (former) ruler in check, no matter how benevolent they might be, should the need arise.
Desperate times call for desperate measures. You're the one asking for ways to deal with Royals, I gave you one. If one particular Royal is bad enough to prompt a feature request taking away their immunity, then surely they're bad enough to consider wrecking a realm over him.
