I know we're supposed to just chuckle at the idea that a child is a psychopath, but there are a few legitimate holes with the meme:
The phone lines went down at the very beginning of the film from the snow storm that took a couple of days to fix.
Marv was doing recon in the beginning disguised as a cop and Kevin recognized him when he was being followed in the van.
Then the cops actually show up for a wellness check, but he doesn't know they are real and is terrified that the burglars are coming back to break in.
Kevin tries numerous harmless, inventive ways of scaring them off first, like the big party or the movie dialogue with the firecrackers, but the burglars are so stupid and persistent, they FAFO by still entering the home, where he never kills either of them, but only then do they get hurt.
It may not be a flawless film, but this gaping plot hole that the meme describes isn't quite accurate.
