Most countries would consider one to be objectively blamed on the basis of consumer protection. This goes on to encompass not only consumer relations per se but also transportation and engineering.
Basically if the business concerns ends and not means, blame is objective instead of subjective. So lawyers and physicians are usually exempt of objective blame. Plastic surgery is a topic of hot debate.
Criminal responsibilty on the other hand is always subjective. To think otherwise would be... well... dictatorial.
Also, to answer the posts above, nowadays parental responsibility is slowly moving from objective only to both objective and subjective. You can be charged with spousal support even if the child isn't yours, if there were reasons to believe so, or you were the sole provider. So: as a man you are screwed either way.
Don't even try to bring it to court, if you live on a developed country - you are going to lose.
