So sorry this happened to you. A member of my tour group had things stolen on our scilly tour this year and I know how upsetting it can be.
Yours is particularly upsetting because you know it wasn’t a random person off the street but a staff member at the hotel. If you haven’t already filed a police report, you should do so immediately.
I don’t believe in blaming the victim for a crime that was done against them. None of us know the whole story here.
Naturally there are things we can do to reduce opportunities for criminal behavior, but we are not responsible when others choose to act in a criminal manner. They hold that responsibility themselves.
RS Europe contracts with hotels up to a few years in advance. It is probably not that easy to effect change in lodging arrangements as one might guess when talking about a large number of rooms in a busy tourist location.
I hope you can move past this and enjoy the rest of your tour. I would hate to see the joy of this tour stolen as well.