In The Suicide Squad, Amanda Waller’s plans appear to be damaged by Blackguard’s betrayal at the start of the movie, but his actions were part of her ploy all along. David Ayer’s Suicide Squad (2016) set Waller up as a quasi-villain for the franchise. James Gunn’s soft reboot doubles down on this concept to make her a thoroughly unsympathetic figure.
Waller sends two teams to Corto Maltese as part of her plans for The Suicide Squad. The first, larger team, lands to the south and while most of them are huddling on the beach to plan their attack, Blackguard (Pete Davidson) runs into the open, announces their presence, and reveals that the majority of the Corto Maltese army is waiting for them in the trees. As he tries to explain to the army that he was the one who called to tip them off to the attack, they shoot him in the face and Rick Flag explains to Waller that Blackguard has sold them out.
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In the DC comics, Blackguard (real name Dick Hertz) is a minor villain and displays below-average intellect, at one point taking a Faustian deal from a demon to be granted average intellect. This is consistent with Davidson’s brief portrayal of the character in The Suicide Squad. Most notably, he needs help from T.D.K. to put on his seatbelt, he displays extreme naivete in expecting the Corto Maltese army to accept him, and he questions whether or not the somehow-surviving Weasel might be a dog of some variety. Furthermore, if his plan had worked, Waller would presumably have activated the bomb in his skull and killed him immediately anyway.
It would be difficult for anyone within the Belle Reve prison to contact the Corto Maltese government to sell Task Force X out, and it seems particularly unlikely that a man of Blackguard’s intellect could complete that task alone. Even if he had been able to find a means of contacting Corto Maltese, he would not have had the full details on the mission that he and his fellow Task Force X members were about to be sent on. However, he displays enough gullibility that the Nick Fury-esque Amanda Waller could easily have manipulated Trending him into selling Team 1 out while thinking it was his own idea. When Flag reports Blackguard’s betrayal, Waller steels herself and denies a retreat, but notably does not look surprised.
For Amanda Waller’s plan, as outlined to Team 2, to be a success, it was necessary for Team 1 to provide a sufficient distraction. Presumably, the Corto Maltese army is normally spread out across the island running various patrols. If Team 1 had dropped on the beach without the army being alerted, it would be possible that the group would be able to sneak through those patrols without detection. At best, they would have created a small distraction and had more of the patrols on the island mobilize towards their position without dying spectacularly in a blaze of glory.