Board Thread:General Discussion/@comment-27033632-20160215163310/@comment-679780-20160218054455

Sometimes people you hate will stump you with convincing arguments.

Sonic 3, Eggman tells Knuckles that he was a friend and Sonic was the intruder. This gullibility could be because of a number of things but I think the fault is mostly Knuckles' isolated upbringing on Angel Island. Knuckles has education in modern languages, but thats pretty much it. He doesn't understand modern social cues for judgement of character.

Another factor could be misread the which depict a clash between a hegehog and a large, domed, mustached like being. Perhaps Knuckles understood it was a clash between good and evil but did not knew who was exactly the good or evil characters in the battle. He recognised Dr. Eggman as the one in the prophacy and Eggman convinced him he was the "good" one.

Sonic Adventure was more of Dr. Eggman trying to get under Knuckles skin and it was actually a fluke that Knuckles believed him. You see, Dr. Eggman told Knuckles Sonic was after the pieces of the Master Emerald but at first Knuckles did not believe him, he had his doubts. However he coincidentally saw Sonic holding the green Chaos Emerald, but believed it was actually one of the pieces of the Master Emerald, so really more of an honest mistake. Sonic calls him a knucklehead from being fooled again in which Knuckles perhaps learned more from his trust-issues with Dr. Eggman.