Dozens of sheriffs say they won’t enforce Illinois’ assault weapons ban. Did they forget their oaths of office?

The horrific mass shooting at Highland Park’s Fourth of July parade last year demanded swift, resolute action — and the Illinois General Assembly delivered. The passage of the Protect Illinois Communities Act makes the state safer by banning high-powered firearms, and magazines with more than 10 rounds for long guns and more than 15 rounds for handguns. People who own assault-style rifles before the ban took effect will have to register their weapons (via a serial number) beginning next year, or face a misdemeanor charge for a first offense, and a felony charge for subsequent violations. A law...