“I don’t know why, but it’s just ingrained in our mind that this is the only way it’s done,” said David Inserra, a policy analyst for homeland security at the Heritage Foundation, who has long advocated for the shift to the use of private companies for screening. … Inserra, of the Heritage Foundation, contends that private companies are better suited to the job of managing airport security. He said they are more adept at managing and retaining employees and can react more quickly to surges in passenger traffic.