Lamo's role in the Manning case drew the ire of Glenn Greenwald, of Salon Magazine. An ardent supporter of WikiLeaks, Greenwald has been a passionate critic of Lamo, suggesting that Lamo lied to Manning by turning him in, and also lied after the fact to cover up the circumstances of Manning's confessions. Greenwald places the incident in the context of what he calls "the Obama administration's unprecedented war on whistle-blowers". Greenwald's critique of Wired Magazine has drawn a response from that magazine which suggests that Greenwald is writing disingenuously: "At his most reasonable, Greenwald impugns our motives, attacks the character of our staff and carefully selects his facts and sources to misrepresent the truth and generate outrage in his readership." In an article about the Bradley Manning case, Greenwald mentions Wired reporter Kevin Poulsen's 1994 felony conviction for computer hacking, suggesting that "over the years, Poulsen has served more or less as Lamo's personal media voice."
Greenwald is skeptical of an earlier story written by Poulsen about Lamo's institutionalization on psychiatric grounds, writing: "Lamo claimed he was diagnosed with Asperger's Syndrome, a somewhat fashionable autism diagnosis which many stars in the computer world have also claimed." In his response, Poulsen accused Greenwald of "name-calling, bizarre conspiracy theories and ad hominem attacks".