If Republicans' views were informed by evidence/data they wouldn't be Republicans.
The only pieces of evidence they'll accept is cherry-picked data that helps them confirm their already preconceived notions about the world.
Absolutely.
But I sometimes ask myself, why can't they just admit that facts don't support their beliefs?
I think it's because they don't want to acknowledge the fact that a majority of this country has different views than they do about a wide range of topics. To be more specific, they realize that a majority of people in this country don't support that their candidate or their party. A majority of people in this country are willing to vote for a non-white president or other type of political leader and don't feel threatened by that. A majority of people in this country are willing to vote for a woman or accept female leadership and don't feel threatened by that. I remember back in 1984 when Jesse Jackson and Geraldine Ferraro were considered almost 'fringe' candidates. In 1984, Reagan won by a landslide.
It's no mystery why Trump campaigned hard and succeeded in places that once produced 'Reagan Democrats.' Many of those who supported Trump in the Rust Belt either were, or would have been, Reagan Democrats. Trump won with these voters in 2016, but he won only because of the quirky electoral college. He lost the popular vote - to a woman. And an unpopular one at that.
What can be seen, thus, is that the Reagan voters still exist, but they are outnumbered by those with different views. Those conservatives that still believe in data and numbers almost certainly had to know this going into the 2020 campaign, which is why the messaging came out way early in Trump Land to create the narrative that Trump would be winning but that Democrats would find a way to magically pull ahead in supposedly bogus mail-in returns in the days following election day. OTOH, there are those that simply don't believe that a Democrats could possibly be more popular than a conservative candidate and who probably are just content to live in a world of conspiracy theories.
When it all gets distilled, I think the MAGA conservatives either believe that Biden somehow officially won, but that he shouldn't have. They believe that he only won because Democrats spent years bringing tens of millions of immigrants into the country to dilute the white vote, that they corrupt Black and Brown voters with promises of welfare expansion, and that the "MSM" is a propaganda ministry for the DNC. In other words, yes, they get that the vote totals say that their guy lost, but Democrats "cheated", and the results shouldn't stand. Their country was "stolen" from them. Similarly, among those who just flatly refuse to believe that Trump could have lost, "reality" is whatever their social media feed says it is.
Either way, it's easy to concoct a justification for believing in the big lie. One doesn't even have to sincerely believe in it; they just have to believe that they, as voters, were somehow deprived of something (in this case, political power). When people believe that they belong at the top of the social hierarchy because America's supposedly a country that was founded by white Christian straight men, the realization that other people don't see it that way is going to be difficult to reconcile. In biology and in nature, there is scarcity - lack of territory, lack of access to water and food - lack of reproductive prospects. In modern, complex civilizations, lack of power is another very real kind of scarcity. It can be dangerous when people of one group believe they've been somehow encroached up or deprived by "others".