Survival skill and damage

[Sabaron]

Under the description of the Survival skill (B223), it states "To live safely in a wilderness situation, you must make a successful Survival roll once per day. Failure inflicts 2d-4 injury on you and anyone in your care; roll seperately for each victim."

I'm having trouble selling my players on this. I suggest that you might sprain an ankle or eat poisonous mushrooms, only to have them counter by saying they're bringing their own food and that sprained ankles shouldn't do as much damage as pistol bullets. One of them talks about "rocket flowers" that explode as you walk past them, to give you an idea of how ridiculous they think this damage is.

Any suggestions on where this damage comes from? I'm not knowledgable enough to convince them that it's reasonable for unskilled people to quickly die in the wilderness. I might add that they're used to D&D, which mostly presents wilderness as unthreatening except for the monsters within.