I would've been far more cruel to the horrible women who did that to Icheb.
I would've dissected her to make her suffer the same fate he did and torture her, revive her, then repeatedly torture her till she can revive no more.
But I'm a far more vengeful person that gets revenge for my loved ones.
Well it's also important to remember that when Icheb was killed..in reality 7 was still quite new to being able to experience the broad, intense scope of human emotions. For her entire life she was either a drone or still had Borg technology that was inhibiting her emotions and in a sense artificially keeping her mental health under wraps. That was removed towards the end of Season 7 of Voyager when she started her quasi-romance with ol' ink face.