The memes are good because they make sense and are funny.
It could be 80% of the country thinks exactly along the same lines. It's like talking shit and ball-busting with the guys you work with. Even the toughest of jobs benefit from that humor.
Memes offer a message to counteract the 20% of the population who are incessantly screaming about some bullshit or the other. There may be a tendency for normies to think that, because they're loud, there are more of them than there actually are.
This 20% is MSM's target audience, too. Notice MSM is going off the deep end, e.g, Porn star (settles for 130K (sure), and Trump's doctor (What regular person questions a doctor under these circumstances?) People are going to write them off.
The memes provide that bit of humor that makes the daily grind a little more bearable.
It's good that they are now appreciated and are being provided a venue and that the majority of Americans who think like that can get a chance to enjoy them.