Part of what underlines the different reactions to the accusations of voter fraud is different views on the prior probability of such fraud. So we can ask, was the prior probability of election fraud high or low?

Some things to consider.
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(1) The Democrats have a long history of election fraud, especially with postal voting. It goes back to the 19th century.
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(2) Leftists in general have a long tradition (since Lenin, and it ramped up in the 60s, eg. Alinsky) of regarding dirty tricks as not only justified but imperative if it helps keep out bad guys from power.
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(3) In the last year large numbers of leftist activists have engaged in extreme behaviour in the name of social justice, eg. trying to burn down cities, violence against shopkeepers, taking over neighbourhoods.
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It's entirely consistent with this mindset that some such people would try something more practical, such as harvesting votes or getting themselves jobs in the vote-counting system.
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(4) If you think Trump is literally Hitler and you have a burning desire to bring him down, why wouldn't you engage in some subterfuge to stop Hitler winning?
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(5) Project Veritas has recorded numerous instances of undercover footage of voter fraud happening. (There is in fact no doubt that it has been happening to some degree, the question is whether it has happened on a large enough scale to affect any results.)
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None of this proves (or is supposed to prove) that large-scale vote fraud happened. It's in response to those people who claim that the whole idea is too ridiculous to even contemplate. My view is that the prior probability of substantial vote fraud is pretty high.