I will say that I don't think a written warning is strictly necessary because EVRY PART of this feels like a warning. The image of the atrophied brain, the tadpole BURROWING into your brain, just the thought of putting a tadpole into your head, its visceral upsetting and you don't need to try hard to convince anyone it's a bad idea.
But Buria makes a good point about it from a story perspective. It feels like this isn't the sort of thing we should be able to do until later in the game, when we have a bit of a clearer understanding of the tadpole and we have a thread to follow specific for controlling rather than removing the parasite.
