Remember, this is the same doctor who was willing to let a group of people die rather than get infected with a disease that doesn't kill you.
To which disease/episode are you referring?
Why, the unnamed one from the infamous and totally not sexist episode Angel One.
This virus is totally out of control here. Until I know exactly what I'm dealing with, I can't let anyone new be exposed.
Doctor, these people are facing their deaths down here.
They might be facing the same thing up here. Until I have a better idea of what I'm dealing with, no one can beam up. I'm sorry, Will, but you must wait.
Again, this virus has only shown to cause great discomfort and over time hasn't resulted in any deaths on a ship with a thousand people on it. This is literally the situation the crew is faced with when trying to save a group of people. Certain death, or possible death. Crusher is insisting on CERTAIN DEATH! What, does she have to do a mountain of paper work for every crew member who gets sick and doesn't want that work to stack on? That's the only reason why she's doing this after all. She doesn't want people to get sick period. What a lazy buffoon. And it's not like anyone who is sick gets any special high tech treatment either. When Captain Picard of all people gets the virus, this is how critical Crusher is to the Captain's health.
You're infected with the virus. Captain. In my opinion, you are no longer physically able to effectively command this vessel.
That is ridiculous, Doctor. I have an away team down there, in less than friendly territory, and in addition I have an appointment with several Romulan battlecruisers.
You have an appointment in your cabin, Captain. With your bed.
Yep. A virus so scary that Crusher believes it is better to face certain death than to get infected, and her method of treating the Captain's health? Go to your room.
At least Doctor Pulaski was smart enough to contain infected people in a shuttle. Where are the shuttles here? Where are the quarantine containment areas? The bloody cargo area has transporters in it. Just transport them into there. Why is Crusher more of a danger to everyone than the freaking virus??
So it's no surprise that someone who used a phaser on a high stun setting which successfully subdued someone being controlled by a parasite would recommend the kill setting in dealing with anyone else being controlled by the parasite. I guess the paper work on a dead host is a lot less work than dealing with people who get sick.