At the time, yes, crime was high and communities of color were begging for zero-tolerance laws. But Barr seems to have missed the following 25 years that proved mass incarceration only made these communities suffer.
There comes a point that there are diminishing returns to locking people up, because you are worsening these problems, which creates more crime.
Expand prison education programs and time credits. Make re-entry easier by eliminating parole fees and public benefit restrictions, and passing ban-the-box laws.