As they should, they deserved it.
That's false.
The X-Men should have known better, half of them having been possessed by external entities in the past.
It does though.
She didn't went to Doom to play with forbidden magics, she went to Doom to try and resurrect her twin sons.
Doom took advantage of her to try and get the Life Force for himself, which he managed to do months later.
Then everyone is a supervillain, top to Bottom, since everyone goes out of his/her way to consult people like Doom, Loki or, for the X-Men, Magneto, Apocalypse, Sinister, Dark Beast, and so on and so forth.
Maybe everyone is a supervillain in your eyes though, that's a possibility.
They were innocents, up until the point they had the Opportunity to release the Phoenix Force to Hope Summers that is.
When they didn't release it to her, when Scott denied her, to her face, the PF, they became responsible of what happened afterward.
Rather that talk be contained here, instead of spilling into other threads uselessly.