Let's face it, people. The Husnock needed killin'. (A valid legal defense in Texas.) Mission accomplished.
And if Kevin could re-create Rishon, couldn't he just as easily have re-created the Husnock? Science Fiction, at least as far as episodic television is concerned, is an illogical, needy bitch.
For me, personally, I didn't like this episode because it depicts the torture of Troi and I don't enjoy watching people suffer. But that's just me.