Well in the VR, and in the ship in general.
Since the VR is their only escape in this 10 year journey, they need to be able to use it. And I'm assuming the computer is to blame for the "death".
One thing the pilot establishes in that respect is that the VR was originally designed to better run the ship's systems, and we saw an example of this when the XO used the VR to load the nukes into the ion drive. So even if they cut off recreational use (which I don't see happening now that they've lost their authority figure--even if the M.D. and the psychologist told them all to cut it, I'm sure quite a few of them would still be sneaking in sessions), they still have to deal with the fact that it's tied into the ship's system, and has perhaps 'invaded' the onboard computer. Certainly, it could blow them all to hell just by screwing with the program the next time they try to detonate more nukes, which is as complete a threat as possible.
Fictitiously yours, Trent Roman