Acceptable risk is always the risk one runs voluntarily, unacceptable risk is the risk other people actions or lack of actions put me into. So often the same people who practise a high risk sport complain about a lower risk industrial plant in the vicinity.

For industries and work, there are some measurable standards (perhaps depending upon country) which make sense:

If one hour of working is less dangerous or at most as dangerous as one hour of non-working (without sleeping) in the same country then there is no good reason to complain about the level of dangers of this particular work according to court decisions.

One standard for a universally acceptable lowest risk level (in the sense, that it is not worth trying or spending money to reduce this level of risk furthermore) is the risk of dying between 5 and 15 years of age.

One paradox I see in me (and other people): the less we lose by a sudden death (in terms of expected remaining years to live) the more we avoid risks.

Wolfgang