Democrats have to be prepared because of what Trump did on and after Election Day 2020 and what he's been saying during his current campaign. Republicans have succeeded in forming an online army of election deniers ready to issue unsubstantiated and utterly baseless claims of election fraud. And a number of would-be electors for Trump in battleground states are election deniers, some of whom are facing criminal charges. This is a dangerous time.
Democrats haven't done enough to assure election integrity and are always in court trying to usurp election laws. Luckily, the US Supreme Court has brought some common sense to the table. But that doesn't change the fact that US election systems are vulnerable, particularly to hackers, and there's too much smoke about election fraud for there not to be some fires. Republicans will handle the situation accordingly, even if Trump has to declare victory early based on incoming tallies.