に至いたっては

に至っては is used to draw attention to a specific example that stands out from a general situation. It often introduces a surprising, extreme, or noteworthy case and signals that what follows is more remarkable or problematic than the preceding context. It can convey a sense of emphasis or even reproach, highlighting the exceptional nature of the item mentioned. Common contexts include contrasting a broad, general statement with a particularly striking instance, or pointing out a case that is unusually significant within a broader topic. Note that the following clause usually presents a judgment, observation, or evaluation about the emphasized item.