Forgetting to cite a source is something anyone could do, and in Mpamaegbu's case I think it might be the truth.  I just posted my opinion about it in the Report Plagiarism thread where it was uncovered.  If that turns out to be the only instance of Mpamaegbu not citing a source, then I'd probably give him the benefit of the doubt if I were the manager of the BestChange campaign.  As I said in my post, I'm fairly certain Mpamaegbu knows the consequences of plagiarizing and that a good number of members are hard at work sniffing out examples of it.