Answer:
Although this article presents information that supports your thesis, what you should take into consideration is whether the article is biased.
Explanation:
As the author of the article was once an officer under MacArthur, he may be criticizing the logic used by Truman to dismiss MacArthur, based on his admiration for MacArthur and not on real and accurate facts. In that case, you should look for more articles that deal with this subject, to realize what the author in what points the author was biased and at what points he was unbiased with the information.