I think I would prefer the RSPCA not to be armed, I know we do have a dog fighting problem in this country (I saw a program about it), i assume when dealing with something like this the police are brought in. The RSPCA are a charity not a law enforcement agency, they can ask people to sign animals over to them, but if they want to remove animals, they will need to do it on some other authority, ie a court order or with the police (I assume). Unless of course you know different