Answer: In the majority opinion for Tinker v. Des Moines Independent Community School District, Justice Black argues that students do not lose their constitutional rights to freedom of expression at school. He further argues that schools can only limit those rights if they can demonstrate that the speech or conduct in question would materially and substantially disrupt the school's educational mission.
Justice Black's reasoning in the majority opinion is strong in that he emphasizes the importance of protecting students' First Amendment rights and recognizes that students have a right to express their political and social views in schools. He argues that such expression can contribute to the marketplace of ideas and that students should be encouraged to participate in the democratic process.
One of the concerns with Justice Black's argument, however, is the vague standard he proposes for schools to limit students' speech or conduct. The "material and substantial disruption" standard can be interpreted in different ways, and it could be argued that it gives schools too much discretion to censor student expression. Additionally, Justice Black's opinion does not address the extent to which schools can regulate off-campus speech or conduct, which has become an increasingly contentious issue in recent years.
Overall, while Justice Black's reasoning in the Tinker v. Des Moines opinion is strong in its defense of students' First Amendment rights, it leaves some questions and concerns about how schools can regulate student expression.