Issues with grandchildren who want to interfere with the assisted living decision.

My two siblings and I have recently made the difficult decision to place my elderly mother with dementia in an assisted living home. I am her primary POA and the two siblings are the alternates. The fallout from the decision has been very unexpected and distrubing. Several grandchildren are expressing anger and intolerance of this decision. Keep in mind these same grandchildren were exploiting my mother financially by stealing money, abusing the use of her her debit card and begging for money on a regular basis. In addition, they were taking over her home and bringing in strangers who were not known to my mother. Items were being stolen from her home and street drugs have been found in the house. Adult Protective Services has been involved and threatened to relocate her if we didn't take steps to ensure her safety. One granddaughter with bad credit convinced my mother to sign for a brand new car with a high interest rate and then refused to pay the car note. The bank is still pursuing my mother for this loan. This same granddaughter ran up a $3000 toll bill in this new car that is titled in my mother name and refused to pay the bill. I could go on about the exploitation. Also, my mother was not able to adequately take care of herself or maintain her home and all of these factors lead to our decision. If that's not enough, I heard through the family grapevine that one granddaughter who has a history of violent behavior has threaten to confront me. I get it, they're mad because we've stopped them from continuing to use my mother. Has anyone else encountered these types of issues after moving a loved one to a senior care facility?