We had the Enron business, the banking crisis, the 'cash for honours' with a serving prime minister interviewed by the police while under caution, it goes on and on.
.... none of which, as far as I know, were scandals related to scientific knowledge.
But, you are quite right, the dubious activities of non-scientific entities such as government and commercial enterprise has soured the environment of scientific enhancement. Of course, scientific enhancements have been eagerly grabbed by those with a political motive - which probably doesn't help when it's done for non-scientific reasons, such as the misuse of nuclear technology etc.
But, back to the subject originally presented, I suppose nowadays whenever we are told there is something we are not allowed to do, rather than try to understand why (and whether it's for a good reason or not), more people now simply look for someone to blame and vilify for denying them the right to do as they please (such as "destroying" a river).