In the mid-90s, I was working for a very large high street retailer known throughout the UK. With (then) over 900 shops of various brands, they relied utterly on their IT (of which I was a contractor). Whilst I was there, I saw them downgrade the importance of the whole department. As the demands on us grew, so they ignored what we were telling them.
One week, the data network of the head office collapsed under the strain. Once fixed (three days later) they came hunting. My team and I showed them the weekly reports we had been sending them warning of the overload. They ignored the warnings until the network collapsed under the weight of traffic we had been warning about.
They all take IT for granted - even when it is 100% critical to their operation, as Blackfriar puts it.