Or take Nehru’s decision in the Second Five-Year Plan to invest heavily in the capital good sector. Was it a mistake or a failure? We can argue till the cows come home and will never reach agreement because although it was a mistake, it was not a failure, not a total one anyway.
Likewise, bank nationalisation: mistake or failure? There simply isn’t a straightforward answer.
Likewise, there are decisions that are not mistakes but end up in failure. The US President’s 1978 decision to deregulate the civil aviation industry was not a mistake but it has ended up as a failure for everyone now – airlines, airports, passengers, banks, aircraft manufacturers and of course governments.