How does Justice Black reject the idea that racial prejudice is the motivation for the relocation policy?

Justice Black rejects the idea that racial prejudice motivated the relocation policy by emphasizing the government's stated national security concerns during wartime. He argues that the decision was based on the perceived threat posed by Japanese Americans, rather than on racial animus. Black highlights that the policy was framed as a necessary measure to protect the nation, rather than an act of discrimination against a specific racial group. Thus, he contends that the motivations were rooted in wartime exigencies rather than racial bias.