A mom who survived the Highland Park massacre alongside her 6-year-old son angrily gate-crashed a press event over the Nashville school shooting to rip politicians for “failing” kids — imploring, “How are our children still dying?” “Aren’t you guys tired of covering this?” Ashbey Beasley, 47, asked reporters Monday, seconds after officials finished giving updates about Monday’s school-shooting murders of six, including three 9-year-old kids. “Aren’t you guys tired of being here and covering all these mass shootings?” she asked. “I’m from Highland Park, Illinois — my son and I survived a mass shooting over the summer,” she said of...