Explain sweetly that A4e are merely the outsourcing of sanctions, at the point at which all political parties fully expected to be able do this without public notice. Workfare was the final transformation of a welfare system which was adapted by Thatcher and Blair and which exploited the political welfare blueprint designed by Beveridge.
That this is merely the same conversation as the police and the NHS, but that this was nearly the conclusion and that was possible because all political parties and their acolytes agreed.
Ask them if they ever told someone who wanted to discuss policy consensus they were wrong, or that there was no point. And if they answer yes, explain they are the reason such barbarity was possible.