Everything we interpret, we interpret through our own lens. Unless of course, that magical force exists, that places an interpretation in your mind for you.
But, when we interject objective evidence into the foray, it tends to remove a level of the subjectivity from our personal bias. This doesn't mean our personal bias won't reject the evidence, but it does bring in an outside more objective force.
Science is a good example of dealing in certain levels of evidence and although science is by no means perfect, it tends to self correct as more evidence is discovered. This could be why, those in the field of science, have a much larger agreement in regards to this evidence (and especially as evidence mounts) and what it means, vs those who are in the religious or faith fields, where the conclusions and meanings, can simply be too many to count. This tells me, there is more personal bias in those conclusions.
So, when I personally judge probability by engaging evidence that originates from outside my own mind and was not just interpreted by me, that gives me confidence a level of the personal bias is removed.