I initially attributed this kind of omission as originating from laziness or just not knowing how to copy-and-paste* into their email client. Now I think it actually stems from a much bigger problem: the average computer user's inability to understand cause-and-effect, and their belief that there is just "the error", with a corresponding "the solution", because they think there is only one reason (and not really a real "reason", as it seems to be only understood by "neckbeards") that a computer error could occur.

Thus, it's not laziness, just something that logically follows from the erroneous assumption that there is only one kind of error, and thus, a competent programmer should automatically know the one solution to it.

* In terms of people not being able to copy-and-paste...just because they can do it in Word doesn't mean they realize that function exists in other apps. Take Google's finding that 90% of users didn't know how to use Ctrl-F (http://www.theatlantic.com/technology/archive/2011/08/crazy-...)....just a couple days ago, in the final week of my programming class, one of my students was amazed when I did a Ctrl-F in the terminal.