Ah, very inciteful! I think that is something everyone could agree on. I think it might be a little bit more than that though. I don't believe anyone can be absolulty certain of anything. Yet the need for certainty is hard wired into us. There was a very recent study, I'll try to find it if you like, that in essence showed that all of us will tend to 'conform' objective fact with our subjective morals. If we are confronted with something that is not consistent with our moral values, we get defensive and will look for facts to support our moral values. We will then stretch, twist, and even bend these facts to the extent our rationality will allow to close the loop between subjective value and objective fact.
The study also indicated that, while every single one of us has this tendecy, some will go quite a bit further, to the extent of denying negative consequences. The study looked at conservative and liberal minded individuals. It asked base questions, two which conservatives generally agree with, two which liberals generally agree with. E.g. Is it abortion always wrong? For each bae question they asked numerous background questions. E.g. Even if it saves a life? As well as questions regarding objective facts to suport their position. As the ethical issue becomes more complex everyone was willing to stretch facts to some extent. As the issue became less and less clear, one of two things happened. Either the individual at some point backed off and said you know what, I'm really not absolutly sure, or the individual continued to twist and bend objective fact to greater and greater limits.
Sorry I wasn't planning on citing this as it only snaped into my head. I will try to find it. What this indicates to me, is that a persons objectivity is inverserly correlated with their conception of absolute morality. Individual who believe their ethic is absolute/perfect, will deny, ignore, twist and bend objective facts to support their morality. So will we all, we have an evolutionary need to close the gap between judgment and observation. We all will either modify our moral judgments to account for the facts, and we will all sacrifice our objectivity to bring 'facts' in line with our moral judgments. Those with absolutes tend to bend more facts, those with objectivity, tend to modify moral judgments.