They sure do.
People tend to pay much more attention to that evidence which fits with what they already believe. Evidence that does not fit with it is almost completely ignored. This accounts for a whole lot of human disagreement; religious folks often won't look at evidence against their religion, for example, while non-religious folks often ignore any evidence that religion might be a good thing.
To make matters worse, this seems to be one of the toughest problems for humans to address within themselves. Everybody wants to believe that they have an objective perspective, or that their beliefs are correct; it's almost impossible for someone who truly believes in something to evaluate the evidence against it.
I have experienced this a lot recently. I was raised in a religion that taught, among other things, to be ardent in seeking truth. I am also a student of the scientific method, which teaches the same. But, as you might guess, the religious and scientific truth-seeking methods often give results that contradict each other. As a result I've gained a few things: a profound skepticism for anybody who thinks they know the truth about anything, and a sampling of various worldviews that I've looked at while attempting to find one in which I'm actually comfortable.
I have basically become a relentless agnostic. Almost never do I fully commit to a belief or value, simply because I have seen so many contradictory interpretations of all of them. Most people find this to be extremely frustrating; some even find it to be weak. So it's not going to be everyone's cup of tea. But it has, at least, given me flexibility.
Feel free to email or IM me if you would like to talk.