To expand on this: there are legions of non-violent, opportunistic crimes that put young Americans in jail only to release them years later unskilled, difficult to hire and possibly disenfranchised. At the same time, hosts of violent crimes carry relatively short sentences with no attempts at rehabilitation. And all sorts of society-corroding, sociopathic white-collar crime goes unnoticed by a justice system overloaded by the first group.
Reducing penalties on the former, honing focus on the second and creating an enforcement mechanism for the latter finds bipartisan support (first two play on separate sides of the aisle for a bargain; the last has populist appeal in both camps).