By Henry Giroux, Chaired professor for Scholarship in the Public Interest in the Department of English and Cultural Studies, McMaster University. Samuel Zeif, an 18-year-old senior at Marjory Stoneman Douglas High School in Parkland, Fla., cries after speaking during a listening session with President Donald Trump in Washington on Feb. 21, 2018. (AP Photo/Carolyn Kaster) The…