It's a response to the fact that democrats can create widespread misperceptions through their control of traditional media. For example, in 2018, 66% of Democrats believed that "Russia tampered with vote tallies to get Donald Trump elected President." https://today.yougov.com/politics/articles/20383-russias-imp.... Hillary Clinton never went out and said quite that. But the barrage of coverage from all angles in the media created the same impression as if she had said that.
In another example: how many people know that, after the 2000 election, the Supreme Court found 7-2 that Al Gore's proposed recount strategy was unconstitutional? Nobody knows that Al Gore had employed a strategy of hand-counting ballots only in counties he had won to find more countable votes that would swing disproportionately in his favor.[1] The media completely blacked that out, and everyone now only remembers the 5-4 part of the decision addressing how to fix that constitutional violation. There's more people under the misimpression that Kathleen Harris or Jeb fixed the election in Bush's favor than understand the sneaky maneuvering by Gore that precipitated the whole mess.
[1] E.g. if Gore won a county 2:1, then statistically, every vote rejected by the machine that could be hand counted would be twice as likely to be a Gore vote than a Bush vote. Gore found a loophole in Florida election law that allowed him to use that principle to find more votes in his favor by seeking hand recounts only in two large counties he had won.
Another example of whataboutism, this time about a guy who ran for presidency many many years ago. He's the one who gave attention to this now obvious unconvenient truth. Back then they criticized the energy use of his house, which still compares very pale against the consequences of this, still swept under the carpet today, inconvenient truth.
MAGA didn't happen in a vacuum. Two republican presidents have been elected in the 21st century, and after both of their first elections, the media fostered widespread misperception of the legitimacy of their wins through selective reporting of the truth. For people coming into the leadership of the GOP now, folks in their 40s and 50s like Vance and Johnson, remember the 2000 election very well, but not the Walter Cronkite era when the media was more even-handed. That inevitably shapes their own approach to communication.
In another example: how many people know that, after the 2000 election, the Supreme Court found 7-2 that Al Gore's proposed recount strategy was unconstitutional? Nobody knows that Al Gore had employed a strategy of hand-counting ballots only in counties he had won to find more countable votes that would swing disproportionately in his favor.[1] The media completely blacked that out, and everyone now only remembers the 5-4 part of the decision addressing how to fix that constitutional violation. There's more people under the misimpression that Kathleen Harris or Jeb fixed the election in Bush's favor than understand the sneaky maneuvering by Gore that precipitated the whole mess.
[1] E.g. if Gore won a county 2:1, then statistically, every vote rejected by the machine that could be hand counted would be twice as likely to be a Gore vote than a Bush vote. Gore found a loophole in Florida election law that allowed him to use that principle to find more votes in his favor by seeking hand recounts only in two large counties he had won.