i dont know why the mods that do allow this still hosted in this site, it should be removed imo
This is a naive view to take. You may not agree with admins that make it easy for themselves to read private conversations, but it's silly to suggest that it be made impossible or hinder the ability for an admin to be able to read private conversations at all.
The contents of private conversations are messages that have been communicated among users on your site, data that is stored in your database and on your webserver.
I don't agree with the suggestion proposed in this thread, there's no need for this to be core, but there's are tons of perfectly viable use cases where it an admin may want or need to access this data after the fact.
To sort out internal site disputes or to aid with a law enforcement investigation are the obvious ones.
The data and content of these conversations is stored on the admins server. They are responsible for the contents of that server and what it's used for, and they can access it. Unless there's some sort of end to end user encryption systems between users of the site that's developed, the data will always be relatively easily available to the admin anyway, as Martok already pointed out. So what's wrong with add-ons making it slightly easier to access when those situations arise?
You think any other interactive sites you frequent don't have the ability to read every word you submit to their system?
PS. Your site is really nice King! Some really cool touches and design elements