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DT, tensions should not build up, they are paid to do a job, i agree the pay is low, they should not be in these roles at all if they have issues. After all if you saw someone hit an elderly person on the street one would hope you would go and help. This is no different. Perhaps the only thing one could do is put surveillance cameras in all these homes, drastic but maybe then you wouldn't get carers abusing their position. I am also aware that abuse can happen to them in their own homes, from unkind, uncaring relatives, and that can't be monitored except by social services, and only if another family member notices bruising, or unusual marks etc.
Very difficult situation all round