It is my understanding that there is a psychic that successfully predicted to the year the death of Michael Jackson. This information is verified. Does this establish them as a trusted source?
Do we not take into account the other 250 or so people that were also predicted to die in that time period by the same psychic, but didn't?
Confirmation bias does seem to weigh in heavily in these matters.
It depends on the context and a variety of factors as to whether or not consensus would find the prediction is verified. This is why I qualified it earlier:
"To verify a revelation, it would depend on the context and components of the revelation. If a person claims to receive a revelation that such and such event will take place at a given point in time, that information can be verified once the event takes place or doesn't take place. If the revelation is vague and open to interpretation, then that's a different argument as to whether or not it can be "verified"."
The example you gave, Michael Jackson dying on that day ... kind of vague, esp considering he's a high profile person. Now if this person knew specifics: time of day, could describe the exact setting, the cause, things like that ... it would get more interesting. It would help distinguish it from lucky guess or random chance to something more on the level of a revelation of some kind.
Whether that makes the source trustworthy, is another matter. Depending on a variety of factors.
I've argued before that if you have a person who claims to be a psychic or some such ... and they correctly predict, in extraordinary detail ... say 50 events without error, it arguably doesn't matter with each successive revelation/vision/whatever-they-call-it. Because each new chance is a new opportunity to fail, misstep, make an error. Then that 100% accuracy goes down, and they are no longer trustworthy. And arguably, with each new revelation, it is still a gamble. The odds may be lower depending on their "stats" ... however it's still a risk.
Only in hindsight really could a person be said to be *trustworthy*, if we are going off 100% for example. Once they are finished claiming revelations, you look at their record, if it stands perfect ... sure, why not trustworthy. But this is arguably an inherent issue with any type of revelatory information that involves future events not yet come to pass: there is a risk for error. Even if all the previous predictions show themselves to blow the socks off the world, there is still that chance. So long as time can pass between revelation and verification of that revelation, there is a chance the person could be wrong. So "trustworthy" depends on what one would look at to label such a source as "trustworthy".
Can we expect the politicians that wish to base their actions in government on their alleged 'revelations' to agree with that?
To agree with what ? I understand the type of politician you're referencing, but not sure what you mean by "that" lol. If it's not a point worth hashing out, no worries though.
I could put the concern about the source to the side for the moment, if the results/information rose above imagination, confirmation bias and random selection (they may not be wrong every time), but that is not what is observed.
Verification of a single event is one thing ... trustworthiness is another. "Even a blind hog can find an acorn once in awhile." I may be able to jump into the cockpit of a crashing plane and somehow land it safely, but that doesn't make me a trustworthy pilot.
Likewise with even a verified revelation that fits the criteria you mention (rises above imagination/confirm bias/random selection/etc). But then we have a baby and bathwater scenario. IF a person somehow manages to have such a revelation ... one that really does seem above chance, above random luck, appears to have been a legitimate bit of information, etc ... even if it's just one single instance: Occam's Razor might claim that chimps will eventually type out Shakespeare by accident given long enough, but it still isn't fully explained and MAY point to something not understood yet. Thus the information may essentially be verified, but the source still unverifiable. Which potentially leads us back to the rabbit hole.