Things were being watched much more closely in the senatorial runoff elections. The more Republicans who voted, the more difficult it would have been for the Democrats to win by cheating. Simply giving up and staying home made it way too easy for them.
But did the voting public of Georgia know this? I know I certainly did not know they had increased the guarding against vote fraud. Had they came out and admitted there was massive vote fraud and told everyone they were not going to allow it to happen again, it might have informed the voting public of Georgia that they were serious.
Without public announcements telling people they weren't going to allow the cheating to happen again, how would the public know that they could vote and have their voted counted in a fair election?