There is a huge difference here though.
Wanda was severely depressed, she just lost the love of her life, along with her brother, and tony stark (who she was presumably close to) had also died. And when she first enslaved a town, it was an accident. As we saw in the finale, she had NO idea she was hurting anyone, she genuinely believed she was doing good. Let me say that again: SHE HAD NO IDEA SHE WAS HURTING PEOPLE. And when she found out she was causing them pain, she let them go, and watched her husband and kids die so these people wouldn’t have to suffer anymore.
NOW for j*hn w*lker
He murdered a man in cold blood. He stole the serum knowing it would probably corrupt him. He tried to kill Bucky and Sam in this latest episode without even trying to talk. AND when Sam was trying to get through to Karli, he barged in (before time was up) and ruined the whole operation, not to even mention letting zemo get away which resulted in him destroying the serums.