The British Empire precedes and was multiple times longer than PRC's rule of mainland China. If you're wanting to play the legitimacy game, by your own measuring stick the UK still has more legitimacy over the rule of HK than the PRC.
Care to explain what point you believe you are making?
E over post limit
>You can't commit treason to a country no never agreed to join.
As if they have a say in the matter. British Crown handed them over to PRC and turned them into Chinese citizens. Ergo they can commit treason the second they formally draw breath on Chinese soil. Law finally catching up so said treason can be prosecuted, like any sensible national security framework.
You can't commit treason to a country no never agreed to join.