President Trump called again on Thursday for the opening of more mental hospitals to help prevent mass murders like the one at Marjory Stoneman Douglas High School in Parkland, Fla.

Yet ramping up institutional care, experts say, likely would not have prevented most of the spree killings regularly making headlines in this country.

“We’re going to be talking about mental institutions. And when you have some person like this, you can bring them into a mental institution, and they can see what they can do. But we’ve got to get them out of our communities,” the president said during a meeting at the White House with state and local officials.

In the 1960s, states across the country began to close or shrink mental hospitals after a series of court decisions that limited the powers of state and local officials to commit people. The decline continued for decades, in part because of cuts in both state and federal budgets for mental health care.