I felt like it was one of those episodes where the storytelling got in the way of the practicality.
Julian: I can't free you of your addiction. I can replicate some more ketracel white, though.
Jem'hadar Rogue: No. I must kill them to give them a warrior's death.
*how I would have continued it*
Julian: You don't think that having your own supply of ketracel white is just as good? You will be free from the Founders and their supply plus you will live long enough to continue researching a cure.
Julian: I can't free you of your addiction. I can replicate some more ketracel white, though.
Jem'hadar Rogue: No. I must kill them to give them a warrior's death.
*how I would have continued it*
Julian: You don't think that having your own supply of ketracel white is just as good? You will be free from the Founders and their supply plus you will live long enough to continue researching a cure.