Alex Burness, The Denver PostJohn Castillo, left, testifies on Thursday, Jan. 22, 2020, in favor of a bill to allow some gun owners to carry weapons on school grounds. He was joined at the table by House Minority Leader Patrick Neville. The morning before Kendrick Castillo died defending his classmates from one of the shooters at STEM School Highlands Ranch, his father saw him off from the end of the family’s driveway. “We naturally believe at the end of the day they’re going to come home to us,” John Castillo said.