This man apparently has an “impulse-control” problem. He steals things from her room, comes in during the middle of the night, and yesterday she said he “exposed himself.” Also, my mother desperately wants out and they are giving her sedatives, “as needed.” Which seems to be too often based upon her inability to stay awake during our visits.
So I am assuming the facility is aware of this. If so it isn't OK that he wanders without supervision taking things and exposing himself. This is now something that must be discussed with administration. If there is no way to protect your Mom and other patients it is time to investigate other living conditions. Sometimes Board and Care with fewer residents (often 6 or 7 each with own room and often CHEAPER than memory care) works better. But what is clear is that if this sort of thing is allowed then this is NOT working.
Try to be non adversarial, speak only to those who have power to change anything, and keep following up on this.
I guess your advice of “speaking only to those who have power to change is good.” Thank you.