Documents...Truthful?

I have something to say on this. I do not think all documents are truthful. This goes with photos, music, videos, any type of document really.  It is very hard to be objective if you are gaining some kind of exposure or power from what you are putting out. You can gain bragging rights, tenure, research, power, stature, ect. These things will skew the type of spin or filter one will write with. 

I know American history textbooks are very different from European ones. They almost always have a different story or viewpoint on the same war. News sources are not always truthful. American news skews what is going on in the Middle East tremendously compared to the sources, both people on both sides as well as news, from the region. 

I think math and science are about the only objective type of documents out there. They can be tested and verified and scrutinized and there MUST be a consensus or else the value of the idea is lessened.