People often argue for privatisation by asserting that the profit motive drives efficiency, which is a lie. Profit only drives profiteering, which involves delivering the cheapest product or service for the highest price. In areas such as health or social care, this is a motive which runs against the interests of the people who need those services.
Another, far better and effective motive is good conscience and the desire to do your job properly. It shouldn’t be controversial to say this, but it is hardly ever heard in conversations about privatisation of public services.