An expression applied to leaders who know as little as their followers and are therefore likely to lead them astray: “When it comes to science and technology, many politicians know as little as the average citizen; they're the blind leading the blind.”
blind leading the blind
Those lacking the skills or knowledge for something are being guided by equally inept individuals. For example, Bill's teaching his son carpentry; that's a case of the blind leading the blind. The expression is found in the New Testament as one of Jesus's teachings (Matthew 15:14; Luke 6:39). [c. 1600]