Warning! Spoilers ahead for My Hero Academia Chapter 340!
Ever since Deku accepted the traitor Yuga Aoyama, My Hero Academia fans began speculating that the young hero in training might actually have an ulterior motive, making him as bad as the villain All For One. But hero professor Shota Aizawa just cast aside all doubt.
Not yet officially released in English by Viz Media, Chapter 340 shows Aizawa trying to get a handle on how Yuga feels about his entire unfortunate predicament, especially in regards to him possibly fighting against All For One. Aizawa first tells the traitor that he must fight with them even though Yuga would rather just disappear, before making his shocking statement. In the unofficial translation, Aizawa admits that they—most likely hero society—are no different from All For One since they are essentially using him like a pawn for their own self interest. But what sets Aizawa apart from the villain is that he would also rather not have Yuga living with regret for the rest of his life.
What helped convince many fans that Deku only forgave Yuga so hero society could use him as a double against All For One were actually the shortcomings of Katsuki Bakugo. As Deku began telling Yuga his reasons why he could forgive him, Bakugo thinks, "Deku! I get it now!!" Of course, there was nothing to get. Deku had already proven himself capable of forgiving traitors including Lady Nagant. He still found some good in her even though she was hunting him down for All For One. So, when Deku told Yuga that he didn't think that someone should be labeled a villain for one mistake, he obviously meant it.
There's also the fact that the ways in which Aizawa is demanding Yuga to fight come from his own plan. After Deku originally made his case for Yuga, he was asked if he had anything in mind on how they should move forward. But he didn't. That's how the so-called anti-Paranormal Liberation Front Task Force came to accept Aizawa's currently undisclosed plan because, when Deku admitted he didn't know what to do, Aizawa swept in with his idea. And based on recent events in Chapter 340, whatever Aizawa told the task force does indeed involve Yuga since he's currently trying to convince the traitor to help them instead of just disappearing. So, when Aizawa says that "We're no different" from All For One, that "we" most likely doesn't include Deku. Deku isn't the mastermind behind this dark plan to use Yuga as a pawn—it's Aizawa.
All that aside, the fact that heroes are acting just like All For One shouldn't be that much of a shocker for fans. As earlier chapters of My Hero Academia revealed, the main reason why Lady Nagant turned against hero society was because of all the terrible things they made her do, all for the sake of saving the public image of heroes. But at least Aizawa has the courage to admit these flaws, not just the flaws of heroes in general but his own.