We recently saw a post in Discussion by ChrisHallquist, asking to be talked out of cryonics. It so happened that I'd just read a new short story by Greg Egan which gave me the inspiration to write the following:

It is likely that you would not wish for your brain-state to be available to all-and-sundry, subjecting you to the possibility of being simulated according to their whims. However, you know nothing about the ethics of the society that will exist when the technology to extract and run your brain-state is developed. Thus you are taking a risk of a negative outcome that may be less attractive to you than mere non-existence.

I had little expectation of this actually convincing anyone, but thought it was a fairly novel contribution. When jowen's plea for a refutation went unanswered, I began attempting one myself. What I ended up with closes the door on the scenario I outlined, but opens one I find rather more disturbing.