Last week I wrote my response paper partially on unethical scientists who put their aspirations for eternal glorry in front of reality, and eventually paid the price. I think that it correlates with our discussion both weeks that scientists need to maintain an objective stand point during a study, otherwise they will get too invested in it and be tempted to do unethical things. However, that is obviously easier said than done. Thankfully, we have peer review and boards that review scientists' work to make sure it is legitimate before it can be published.
Here is a link if anyone wants to read about some very unethical science.