Have you seen posts, tweets, memes, etc. with that intro? It seems to be more common recently.
If you think about it for a while, the sense of the intro is that there’s some piece of data — an event, a fact, a quote, etc. — that the poster believes will support a position that the poster holds. However, the poster knows there are people out there, minding their own business and not even talking about that issue, who don’t agree with the poster’s position. The poster feels it is his responsibility to educate them.
Okay, fair enough. If I believe there are a bunch of people “out there” who believe government control of the means of production and distribution is a good idea, I might want to give them a thought or two to turn them against that notion.
In that particular case, I might say “for all you socialists out there.” But in the case of the “I don’t know who needs to hear this” post, no group is mentioned. It’s just “whatever ignoramuses might be within the range of my social media posts, ….”
It rubs me the wrong way, and I’m not exactly sure why.