Let us say we go back to the first time history was recorded, that history was probably biased and etc. However, it was based partly on the "truth" and each time history was passed on or written down it was based on the previous and previous. My point is that the history we have is a direct link to the truth, therefore one should study it and learn what can from it and ultimately learn kernels of truth there are in it.
Unless of course you don't believe in the concept of a past ( which I get the feeling you don't, as in, it doesn't matter what the past was the present is our reference point, thus, anything that is held up as the past could just as easily be a fabrication of the present) then if you think that way your point is moot, because in such a world one shouldn't believe in anything because everything could be a fabrication including reality, the same reality which leads you to become yourself, it makes no sense not to believe in your creator(reality) but believe in yourself(the product of reality), in that case you shouldn't trust reality or yourself.
dictionary.com definiton of reality -
trying to save some people some time