What percentage of the total number of benefits/job center workers in the system have you personally interacted with? How can you be so sure that none of them are actually like Sheila or the guy whose name I'm forgetting? The experiences you cited are only those of one person, so hard to see how another perspective is manipulative because it differs from your own experience.
Anyway, the example I gave shows that not "everybody who works in a benefits office is an ogre" according to Loach's film, which is what you'd claimed.
He shows his hand from the first dialogue in the film, where the woman named Amanda is patiently trying to get Blake to answer simple questions about his health for a questionnaire and he's cursing at her and already being recalcitrant? How does that show a black-and-white version of things, where civil servants are evil villains?He shows his hand from the first piece of dialogue and there is no doubt where the film will go from that moment on.
And Loach hardly stacks everything against the two main characters. For example: