The problem was the focus on Willow concerned she would lose control of her magic, as opposed to her feelings over the events of s6 - it's not just the killing of Warren (and her attempts to kill Jonathan & Tucker's brother) - she threatened to end Dawn, tried to kill Buffy, Anya and Giles and then - influenced by the magics she took from Giles - tried to end the world.
And this is a point I've discussed in the past - when you're a Scooby, essentially all is forgiven. There was a bit of concern from the gang in the episode Same Time, Same Place, but aside from that, was welcomed back into the fold.
When you're not part of the inner circle? Different story. Example: Faith still received side-eye from everyone even though she was good and on the path to redemption.
That wasn't even her either. She was just worried her friends might not like her.
Her mind raping (twice) of Tara was not even considered a subject or issue.
Also turning Magic into a Drug metaphor when only the season before it had been a Lesbian metaphor was a bad move too