There's no conspiracy here, folks. Just plain old-fashioned science. Minimize your exposure (though PROVEN means like masks, social distancing, and washing your hands) and your chances of getting sick are reduced. Not gone, just reduced. Avoid those things and guess what? Your chances of getting the virus are increased. Not a certainty, just increased.
Trump and his circle shrugged off these very simple steps while, by contrast, Biden and his circle followed them religiously. Not hard to do the math here...