Re: "Not changing the default credentials" . .
You're not talking about the Human Race sadly. People take the easy path.
If that leads to mud and shite, then they really don't care or know about it to avoid.
Time to put some obstacles in their path and explain why they're there.
Far too much open source software makes the absurd assumption the user knows what they're doing.
Remember when Routers first became available? They were shipped with no security set as it was assumed professionals were going to use them.
The Public got a shock and manufacturers had to ship them with the security turned on.