WASHINGTON -- “SKYROCKETING MURDER RATES,” claimed the National Fraternal Order of Police. “An explosion of violent crime," said Senate Minority Leader Mitch McConnell. “Democrat-run cities across the country who cut funding for police have seen increases in crime,” tweeted U.S. Rep. Patrick McHenry, R-N.C. On social media and in political speeches, some Republicans and pro-police groups say last year's calls to slash spending on law enforcement have led to a dramatic rise in killings in cities overseen by Democrats. The increases they cite are real, and several big cities did make cuts to police spending. But the reductions were mostly...