She was trying to force Worf to live as a paraplegic. It might be acceptable for a human, but for a klingon, that kind of existence is psychological torture. Worf had the right to choose death. Crusher disregarded Worf's wellbeing and rejected his decision and bodily autonomy because she couldn't reconcile her feelings, and when another option was presented for a full recovery, she tried to intervene because she unilaterally decided that the risk of death was worse.

Then she had the fucking gall to give that "you scare me, doctor" speech.

I've seen it half a dozen times and it still boils my fucking blood, and I wish she had suffered some kind of fallout. Such a lack of empathy for her patient makes her unfit for duty as a medical officer in my eyes.