A non-standard curriculum

A lack of genetic diversity poses a threat to the survival of a species. If there's a substantial amount of variation in a population, then it's more likely that at least some proportion of its members will be resistant to any given disease, thereby reducing the likelihood that a single epidemic will succeed in wiping out the whole population.

A similar argument can be made for diversity in education. If there's a substantial amount of variation in the way people are educated, then it's more likely that at least some proportion of the population will be able to detect mistakes in policy and so on before they cause damage, thereby reducing the likelihood that a single ideology will succeed in wiping out the civilisation we live in.

This is also the thinking behind diversification of investments. Simultaneously investing in both umbrellas and sunscreen has a way of reducing risk.