Risks perceived to be voluntary are more accepted than risks perceived to be imposed.
Risks perceived to be under an individual's control are more accepted than risks perceived to be controlled by others. Risks perceived to be have clear benefits are more accepted than risks perceived to have little or no benefit. Risks perceived to be fairly distributed are more accepted than risks perceived to be unfairly distributed. Risks perceived to be natural are more accepted than risks perceived to be manmade. Risks perceived to be generated by a trusted source are more accepted than risks perceived to be generated by an untrusted source.