A bit of both...
First the users...
Back in the early 1990s, I was a break/fix techie covering a large number of small sites. There was a very tightly defined SLA that meant that we had to fix everything first time even if it involved getting the soldering iron out for component repair on monitors, PCs and so on. Everything that was not on the service schedule or was user error was chargeable.
One such site had had warnings from senior manglement that they were generating too many chargeable calls because of their really basic errors. I was called out because one of the green-screen terminals was dead, refused to boot. I decided to be civil and call in advance because the most common fault was them being pulled forward and removing the power cable from the over-tight cable management. User "I'm not stupid you know, I know you don't pull them forward". I turn up at site, before I touch anything, I point the user to the dust trail at the back of the terminal that had been disturbed and the power cable was out. She said "you must have just done that!" By magic as I'd been standing with her at the time? Plug in, chargeable job as it fires up immediately.
Another site had a user complain that she couldn't access the terminal service. Sounded legit, light on unit's power switch, nothing on the screen and the brightness/contrast dials did nothing. On site, I saw it was a standard PC monitor. The manager of the unit had bough a few to "make the terminal service faster". Most users had never seen a PC before and all they knew were the green-screen things. Manager got all ranty at me telling me to "just make it work, it's a computer, make it work!" Once I explained it was an unsupported device, he (the manager) agreed to it being chargeable for me to install the terminal access software on the PCs he'd bought and he'd arrange training for his staff on how to work PCs. Then after I plugged in the first one, it had no OS on it, had no OS disks and the manager said "why would I need to buy software when we don't have any on the older machines". A complaint was registered against me because I was too incompetent to resolve a simple issue. My manager replied with an invoice for chargeable callout plus 2 hours, no other comment. Two weeks later after another guy had done the install work, for a fee, I was called out again with the call details being "New, faster PCs have not made terminal service any faster"...
A good friend of mine showed me a keyboard he replaced on NHS site. User reported that some of the numbers on the keypad were wrong when displayed on the screen, he pressed 1 displayed 7, 2 displayed 8 and 3 displayed 9 and vice versa. When questioned, he said he preferred the way numbers were on his phone's keypad so wedged out the keys thinking that that would do the job as, after all, computers should be smart enough to know that he was pressing 7 to get 7. The keys wouldn't go back in as he'd snapped a few retainers so superglued them in.
I could spend many hours typing anecdotes about that time of my life but it's only really fair to let some of the techie people have fingers pointed a them as well:
One very highly paid (for the time in 1999) Oracle DBA working on site called me at 4:55 saying he was going home and hadn't achieved anything that day because he hadn't been able to get a script doing what he wanted. He hadn't bothered saying anything when he turned up in the morning because he tried once and thought someone else would fix it when they noticed it wasn't working themselves. The idiot had logged onto the wrong server and had run a completely different named script that was a simple maintenance script that had no output. Apparently it was our fault for not being there to supervise him. A few weeks later he complained to my manager that I was micromanaging him.
Another place had two senior Exchange techies, there was a third who left and wasn't replaced. He told the other two before he left that someone had to redo the backup solution as it was currently a bodge job using his admin account for permissions (yes, really...). The two that were left thought the other one would do it. 8 months later a very senior manager asked for a restore of a mailbox that they believed a user had deleted to help hide criminal insider trading activity, this mailbox was to be handed over in an as-is format to the relevant authorities for review. Two techies look at each other with increasing horror realising that there were NO backups of any mailboxes since the leaving techie's admin account was disabled. Oh the fun that the company had explaining that one. I was on the project team that had to be constituted to try to "do something"