Scientists also have to be objective once the experiments are completed because they have to decide what information to use from their studies. If what Messing says is true, which I do not believe it is, I do think that it will decrease the credibility of the information. THey continue to research until there findings seem conclusive. If they find that their initial assumption is incorrect, they may obtain another and continue from there. They are being objective, but without some objectivity a scientist would not not have anything to base their experiment around becuase they must have some idea of where their experiment is going to lead.
Objectivity is only natural.