An article from Reason's Volokh Conspiracy examines the case of an Oregon man who shot a school shooter. The central legal question is whether the man broke Oregon law by bringing a gun onto school grounds. The source notes that some people answer "yes" to that question, but they do so as an objection to gun control laws, not as a criticism of the man's actions.
The piece appears to explore the legal irony: a person who stops a mass shooting may still be in technical violation of gun-free school zone laws. The source does not provide a definitive answer, but it frames the debate around whether such laws create unintended consequences. Because there is only one source, we cannot compare differing viewpoints beyond what is noted.