people who think they know the answer may or may not be hyped up.
hyped up people may or may not think they know the answer.
"having potential to make change" is different from knowing the answer. how different it is depends on the person and on circumstance and probably on other things too.
for a recent example of someone who seems to think he knows an answer, i refer you here
http://anarchistnews.org/content/racism-north-american-anarchist-black-cross-conference
but the most blatant examples are sort of boring.
we all have places where we think we know the answer, i expect. how we deal with that "knowing" is as much a personal affair as anything else. so perhaps the problem isn't the knowing, but the acting like a thing is known?
i dunno, how philosophical do you wanna get?
edited for parallel construction and... stuff.