The arrow of time means things done later supercede/void/alter things done earlier.
That's a pretty convenient way to minimize past actions.
Depends on how you limit "they". Prior to and after the 2016 election, people (including politicians) called for protest and (after) overturning. They failed to incite anyone sufficiently to produce such a result. There was talk prior to 2020 about how to react, on both sides. Democrats have been muddying the waters with insinuations that the midterms might not be clean. Not sure how it's possible to condemn Trump and his immediate direct supporters without condemning everyone who did at least that much, or more.
Politicians and pundits employing "overturn" and "illegitimate" election rhetoric tend to fall in line
once the losing candidate publicly concedes. That's why "they failed to incite anyone sufficiently" in 2016.
Or, as you suggest, Trump's 2020 efforts - which go far beyond rhetoric - could be seen to supersede/void/alter how threatening any 2016 musings should be considered.
There isn't just one instance of election denial in the US. Everyone forgets all the challenges that dead-ended and only remembers the mob on Jan 6.
I fully agree - election denial is not limited to Trump, and Republicans who support him. While other politicians, pundits, and partisans from both parties have engaged in this rhetoric, Trump's efforts went far beyond words.
People remember "the mob" because it was violent, unprecedented, and a literal assault on a symbol of American democracy.
A lot of pressure was applied, but the system didn't fail. It's easy to condemn anything Trump does; the test is whether the rules continue to be applied equally. If not, then it was all just bullsh!t serving political exigencies.
That the "system didn't fail" doesn't minimize Donald Trump's attempts to ignore, circumvent, and manipulate that very system.
I suppose we'll only know if the "rules continue to be applied equally" if another failed candidate fails to concede, files dubious court challenges, continuously falsely claims fraud, attempts to alter the slate of state-certified Electoral College electors in 7 states, is taped asking state officials to "find" votes etc