Involuntary vs Voluntary Risks

[Al Tschaeche <xat@inel.gov>]

It has been said that humans are more likely to accept risks over which they
exercise voluntary control than riske over which they do not exercise
voluntary control.  The latter are sometimes called involuntary risks.  I
seem to remember an article in the HPS Journal or the HPS Newsletter quite a
number of years ago that set forth cogent arguments against distinguishing
between those two types of risks.  The author's thesis was that
acceptability of risk should have nothing to do with whether a risk is
voluntary or involuntary.  Does anyone out there remember such an article,
and, if so, would you be willing to give me the reference?  
Alternatively, does anyone know of a reference to documents that provide
arguments against the idea that voluntary risks are more acceptable than
involuntary risks?
Thanks in advance.  Al Tschaeche xat@inel.gov