This is what I have been saying to people who can't understand what happened yesterday.
It's the most simple concise response: why did something that has never happened in the history of our elections suddenly happen all at once in the states that ended up determining the outcome?
You can not and will not find an appropriate response, because even Biden supporters in their gut know the answer.
The problem is, a well prepared criminal will have an explanation for anything.
Murderers have gotten off even though there was overwhelming evidence linking them to the crime and they had an extremely uncommon set of tools, chemicals and other supplies in their trunk, just because they were able to come up with an alternative explanation for every little detail.