You are making three critically mistaken assumptions:

1. Republicans would have allowed the Epstein Files to become public, or publicized, or not impeached Biden for allowing them to do so. This is false. We know this is false because back in 2016 they extorted Obama the same way about the fact that Trump was on Putins payroll during the election. Democrats, especially Democrats who can read the news, would have gone along with it too, and no one has EVER wanted Kamala Harris in the oval office, not even her own district.

2. That Merrick Garland, Biden's handpicked AG, was working primarily on his behalf. Merrick Garland was a Republican through and through, and he was only nominated as a dare to Mitch McConnell to get him to not even consider a person McConnell himself had suggested as a conservative SCOTUS nominee. Obvious McConnell took the dare and won. You can tell this is true again by the fact that Garland missed every moment or intention when investigating Trump could and should have been taken, and either nixed the investigations (as he did the J6th investigation) or pushed people off the investigation (as he did with the Epstein Files and Epsteins murder). Biden chose to take a hands off approach to the DOJ because he believed that the law still mattered, even despite the overwhelming evidence that it didn't, and hadn't since he was still a VP, and not senile.

3. That Republican voters would care that Trump is a child molester. Its a foregone conclusion he's a child molester. All of his friends and everyone who's spent time with him socially knows he's a child molester. Republicans do not care. Its not the first, the second, the third, or the fourth time Republicans have publicly defended child molesters both in media and in courts of law. They could publish the tapes of Trump having sex with underage girls on YouTube with time and date stamps and give them to labs that specialize in analyzing video (assuming they exist, I'm nearly certain the DOJ destroyed them in the first Trump term) and Republicans would still defend them. Mostly because most of them are also child molesters, at least the ones that can afford to be.