Well contextually, no one knew about Wanda, Doom and the Life Force at that moment in time so the X-men are perfectly justified in their response to wanting to detain the Scarlet Witch. Remember, she wiped out 98% of all mutants, leading to countless deaths and the near extinction of a species.
Additionally at that moment she'd actually not cured anyone yet, it was only later in the issue that she returned Rictor's powers to him. I should also say that, that is the only person we've seen her restore the X-Gene to, so cut the bs that she's a philanthropic saint.
Plus, 'she wasn't in control of her actions' falls very flat when you look at how the hypocritically the Avengers treated Cyclops and Hope during and post AvX. (Also this would've been like the umpteenth time Wanda had been possessed so it must be starting to wear thin with everyone).