Why it is important is explained at
http://www.laprogressive.com/mandatory-minimum-sentencing/. The bill is designed “to prevent unjust and irrational criminal punishments.” If enacted, it would allow judges more discretion in sentencing below the mandatory minimum for many federal crimes if they are convinced that doing so would not endanger public safety. Not only would it save lives and money from being wasted, it would also demonstrate to politicians and average citizens in this time of ideological rigidity that Congress still can, at least occasionally, come together to work for the common good.