The harm would've already been done. And that's not really a solution, is it?
Not unless you relied on integrity of people to ignore what the person wrote, and hopefully proper and strict enforcement would prevent anyone from trying. Also, realmwide would because otherwise someone could roleplay to just a single person effectively making it impossible to catch.
I know I would be really pissed if I was planning on writing a roleplay and then get wounded, and now can't because some would abuse a nice system.