You have to remember this site is called "superuser" not "idiotuser". You said "it's useful to have such a warning". I don't think it's useful to you at all. It's useful to somebody that perhaps doesn't know that one shouldn't just download any old file and execute it. You shouldn't be writing advice about what is recommended or isn't recommended, what is useful or is not useful, when you only have in mind a non-technical user and wouldn't follow your own advice. – barlop 7 mins ago
I have downvoted you, I believe justifiably.If you amend your note sufficiently then I will remove the downvote just so that you don't have the -1 that you currently have, which I believe you thoroughly deserve with that note of yours. Refer to my comment above this one for an explanation.
I will remove it, but to defend it, there are many files that I have downloaded that are still on my drives years later. Some of them are utilities that may be harmful in certain circumstances. Knowing that they came from the web as opposed to something that I wrote is useful. In addition, there have been a few times when I loaded a web page and a file started to download. While I removed it right afterwards, this is a risk, albeit small. Your problem with my note is really a problem with microsoft. They thought this would be a useful feature. You think that for non "idiotusers" its worthless.
It seems rather arbitrary to me, one way or another. And with regard to "idiotusers" there have times where I have posted an answer with something like "go to device manager" and gotten a response of "where is that." You or I may think that is trivial, but to some people its not. My note was not insulting (at least I don't think so) and it could have been helpful. I don't see things like this as an issue.
This was posted after I included a statement that a warning might not be needed but it could be helpful.
How valid is the point of view that answers should speak to a technical audience, as opposed to the average person? Are both OK? Is there a middle ground that should be sought?