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Oxford philosopher Timothy Williamson suggests that scepticism initially looks appealing (despite its bleak consequences) because it is a good thing carried too far. The good thing is that we have a healthy critical ability to double-check individual things we believe by suspending judgement in them temporarily to see whether they really fit with the rest of what we know. But if this ability to suspend individual beliefs serves as a useful immune system to weed out inconsistent and ungrounded ideas, scepticism is like an autoimmune disease in which the protective mechanism goes too far and attacks the healthy parts of the organism. Once we have suspended too much—for example, once we have brought into doubt the reality of the whole outer world—we no longer have the resources to reconfirm or support any of the perfectly reasonable things we believe.
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