Dave Bateman, the software entrepreneur who made antisemitic statements this week in an email reportedly sent to several dozen people, has a history of spewing offensive and bizarre commentary and conspiracies online. “Fau Chi and the Woohoo Han lab have almost killed as many people as Hitler; and they are just getting started,” he wrote in October, referring to President Biden’s chief medical advisor, Anthony Fauci. He separately ranted against the Federal Reserve’s interest rate policy in November, appending the text with an image of a member of the Rothschild family—a frequent subject of antisemitic conspiracy theories—and claimed that a...