It's not politics, it goes a little like this:
Everything man knows and believes is due to indoctrination, for example:
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There are no units of measurement, they were just made up by scientists. So an inch could actually be an unbelievably long way.
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There are no shapes, we just gave names to describe what we saw, assuming that the electromagnetic image we get is an accurate representation of what the object actually looks like, so a circle could really be rectangular
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There are no colours, see the second statement, we again just gave convenient names to the colours we perceived without any real way of measuring if what we perceived is accurate
Ergo it's entirely likely we're all two foot tall green blobs, who have deluded ourselves into this grand perception of how we (and everything else) look(s).