There is some value in criticizing that which has been improperly popularly lionized, but this introduces its own skew. Zinn managed to truly piss me off because in his chapter on WWII he either did not mention or mentioned only in passing the rape of Nanking and similar Japanese atrocities, spent a few paragraphs on the Holocaust, surprisingly didn’t particularly mention the firebombings of Dresden or Tokyo, but harped for several pages on the atomic bombs. Perhaps they needed examination, but incessantly and loudly examining them at the expense of everything else leaves the reader with a distinct impression of Zinn’s own political beliefs.
I think this might be behind much of (American) conservatives’ anger with liberals in the foreign policy domain, as exemplified by the insult “blame-America-first”. Liberals are questioning America’s policies, which is well and good, while leaving it as read that the actions of their adversaries (since the dynamic evolved, usually USSR or terrorists) are much worse. Conservatives see that apparent bias and gain the impression that all liberals hate America in particular. The situation is not improved by much political mind-death on all sides. This is probably going off on a bit of a tangent, but it’s at least marginally relevant.
That is an oddity. However, note that they don’t have computers, and setting up a schedule properly for everyone who’s signed up for whatever classes seems like it might well be incredibly difficult without same. It could be that someone saw this and said ‘F* it, just give them time machines.’ That would certainly fit with the level of sense shown so far in magical Britain.