Memes aren't designed to teach or contextualize. They're designed to frame.
In which case, the claim made by the meme is unarguable regardless of whether or not the reader is in a position to verify its contents. This serves to either a) persuade the person looking at the meme that it's the truth OR b) motivate him to research what he's seeing.
This is exactly why the phrase "Crooked Hillary" is so popular right now.
To be fair however, the painting with the presidents doesn't qualify as a meme. I just thought it was splendidly executed subtext.
