In a TIME column dedicated to addressing the epidemic of violence involving black men, including an alarming rate of black-on-black homicides in his city and others, Philadelphia Mayor Michael Nutter offers these thoughts:

We know clearly that there are a few things that work: investing more in Head Start programs, summer jobs and programs for teens and community-development block grants for cities to put people to work. Those three areas have been cut significantly over the past few years.

It’s a great illustration of the maxim, often attributed to Will Rogers, that “It’s not what we don’t know that hurts. It’s what we know that ain’t so.” Nutter “clearly knows” that investing more in Head Start programs works, despite the strong evidence against that proposition.