I understand the reasoning behind MSNBC’s rebroadcasting the live NBC coverage of six years ago. The crass rationale is that CNN did it (albeit via streaming) last year, and they had to wait until this year to copycat. Less crass is that after an orgy of replays, the footage was locked away for years, and the chaotic and war-fogged reporting was superseded by a more coherent narrative to suit what followed. Enough time has passed, perhaps, to recall the confusion.
That they repeated that repeat after dark makes less sense. The broken verisimilitude, for some odd reason, makes it feel crass. Or perhaps it exposes the innate crassness of the re-enactment.