That's part of the reason why it doesn't work. Quentin Beck has legit issues with Tony Stark. Tony fired him and then basically kept his stuff and passed it as his. Why would Quentin create an illusion of Tony Stark being disappointed in Peter rather than show an illusion that makes Iron Man as someone who never cared for Peter and was always a fake. And again you can't keep pitching Tony Stark as a paragon for Spider-Man to look up to and to browbeat Peter with, when Stark's f--kups continuously cause problems for Peter and the MCU. Thanks to Stark, you have the Vulture and now Mysterio and before that Ultron, Wanda and Pietro when they were bad-guys, breaking up the Avengers, Killian (part responsibility since that guy was hopeless). If you keep bringing that over and over again it literally doesn't make sense. And yet the movie's big emotional scene is all about Peter becoming like Tony Stark. This again is brand politics overriding the dramatic logic of the story and character.
A Scarecrow sequence of the parent telling their kid or indicating that it's a disappointment only works when that parental authority is someone you can buy. If it isn't then the scene dies.
In the case of Scorpion, Jameson wanted him to bring that menace to justice. Scorpion went rogue on him. That's there in the original story itself. And again, that kind of thing is cancelled out by Peter goading Jameson to fund the Spider-Slayers.
In the case of Spider-Slayer, Peter Parker goaded Jameson into funding Smythe and even talked him into controlling the robots. Read ASM #25. That's there. Peter did that because it was a lean weak and he needed bad guys to beat up. So I don't think Peter creating villains is entirely unintentional. In the case of Venom and Carnage, that's more indirect yes. In the case of Batman, Joker was collateral damage in a fight. So he's definitely culpable to some extent.Batman and Spider-Man indirectly created their respective villains they didnt go out of their way to make Joker Joker, Eddie Brock venom. Jameson knew exactly what he was getting into