Not every crime an MP can commit is Misuse of Authority. Misuse of Authority is merely a crime that only MPs or deputized Marines can be charged with.
Committing a crime as a member of the MPs is in of itself a Neglect of Duty as you are duty-bound to follow Marine Law as an MP. I don’t know if it is still enforced this way, but spawning as an MP even warns you that any breaking of the law as MP can lead to an instant note/warning/roleban depending on the severity of the Lawbreak/Context.
Breaking every window in briefing or something like that isn’t really “exercising of power to a malicious extent”, even if the MP intended to disrupt briefing and cause a mutiny.
This mostly just means that just because an MP commits a minor crime doesn’t mean that you can automatically treat it like a major one because of the required presence of the NoD Charge.
They have to actually do a Major Crime for that. This is relevant for possible demotion versus if it was a major it’s a Given that they can’t be an MP anymore.
It’s just being wordy to avoid being misconstrued.