No one is comfortable with election fraud. Election Fraud is a well researched problem (by republicans too), and it's been shown again and again that it is an incredibly small problem. You are talking about a couple thousand confirmed cases [1] in elections where tens of millions of votes were cast. Claims of election fraud are not new.

A bigger problem is voter suppression, through ever growing extraneous requirements (such as Harris County, a population of 5 million, only have 1 ballot drop off, due to a law to prevent more than one drop off per county). Voter supression however does not get anywhere near the same amount of attention.

[1] https://www.heritage.org/voterfraud