He just straight up does it, and then blames someone else after the fact.  The final paragraph pretty much says it all.

“In any case, the vice president should know better than to spout off half-baked facts in service of a dubious argument. Even if one believes there is a link between crime and the number of police—which is debatable and subject to many caveats—there is no excuse to make the dramatic claim that more people will die or be raped without additional funds for police. When making such a breathtaking charge, you had better have your facts straight.”

But remember, it’s the right who plays on the fears of the population.  Now shut up and vote for massive tax increases or your mother will be raped.

Biden’s absurd claims about rising rape and murder rates – The Fact Checker – The Washington Post.