Yes it is stupid. I will edit for clarity, though I believe that @jpmc26's response is better.

I feel like we are missing part of the context? Was this observation made around a complaint around efficiency? Often, criticism comes with suggestion for root cause which may or may not be relevant.

@Wayne: I think we are just arguing terminology. Those reasons, to me, aren't ignorance. Under the best possible light, they reflect issues with prioritization of short term/long term costs/gains and corporate(external to team) culture. However, it is usually a motivational issue. Those issues are much harder to solve than a lack of education.

@Wayne: if it were just technical ignorance, simply pointing out the gaps in knowledge would be sufficient. Given that isn't the case, it is far more than ignorance. Many people, by their nature and situation, are resistant to change. As for the reasons, lots. A simple search of "why are people resistant to change" will yield large numbers of useful results.