Agree that Head Start is only a "feel-good" bandaid. Studies have shown that kids who go through Head Start are just as likely to become criminals, as their peers who didn't go to Head Start.
But those Head Start kids who go on to a life of crime are usually not the mass-shooting types.
The mass shooters are more likely to be white kids from the relatively well-off suburbs. They aren't in the demographic that was sent to Head Start. However I would bet that the vast majority of school shooters had been dumped in daycare (private daycare) at an early age.
You won't find the MSM pursuing that angle; it is too politically incorrect.
There a lot of mentally deficient of ALL colors at Head Start. To the point that my sister who works for them was very alarmed the direction of these kids have been going the last 5 years. More and more problem kids being born.