“Government’s first duty,” President Reagan said in 1981 and President Trump recently tweeted, “is to protect the people, not run their lives.” The safety of law-abiding citizens has always been a core principle of conservatism. And it is why we need to take this opportunity to pass real criminal-justice reform now. Although violent crime rose during the final two years of President Obama’s time in office, it decreased during the first year of Trump’s presidency. We need to keep that momentum going. And criminal justice reform can help us do that in two ways. First, commonsense sentencing...