I'm used to living with what could easily kill me.

[She means who could easily kill her, but that's an unnecessary detail.]

Things are different here. We have choices and freedom here.

You don't have to be a biologist here, if you don't want to be. And if you do decide to do that type of work - an alive and functioning biologist has to be better than one that's hurt or dead, right?

[And there's the time and resources doctors would have to put into treating him. As well as the risk to others who'd have to rescue him.]

You should at least arm yourself first.