The "only a fiver" and "people with power have done worse and not been punished" arguments are old, misguided and simple minded.
Let's just step back and take a look at this. For reasons which are irrelevant, your parent/partner/child requires a carer, and you cannot be watching over the carer's shoulder continuously.
Your parent/partner/child also experiences severe pain. Pain that requires regular hydromorphone/morphine/oxycodone. You have to trust that the carer is actually giving your loved one the medication, instead of using it themselves or taking it for illicit resale.
Now, if you knew your carer has already been caught committing theft (as the situation in question is not an accusation or suspicion, it is fact - the cameras were put in BECAUSE of suspicion), how likely would you be to feel entirely comfortable that nothing untoward was occurring in your home?
A dear friend of mine has nursing for her daughter. It was morphine that was intended for her 6 year old daughter that was being signed off as having been administered to DD but taken by the nurse, instead.
You know how it came to a head? The nurse overdosed on the child's morphine, in the child's home, while she was supposed to be caring for the child and the mother was supposed to be sleeping.
This experience is absolutely true. I have been supporting the mother during the prosecution of the nurse in question.
You ask again why £5 matters? It is NOT the money. It is the breach of trust. Simple as that.