People had long predicted that in a world full of competing ideas, many will just take the easy way out and declare that the truth is simply unknowable, and no one knows what they are talking about. Your comment is a perfect example of that.

Yes, the world is still a mystery in many ways and no one has cracked the code. But the ideas put forward by kooks like Trump, anti-vaxxers and creationists are still idiotic and vastly inferior to the general mainstream ideas advocated by serious scientists and researchers. Just because there's a possibility of being wrong, isn't a reason to succumb to defeatism or paralysis-by-analysis.

There is a wealth of knowledge out there that can help you better understand the world and live your life. Yes, finding and vetting this knowledge is hard work, but it sure beats watching The Jersey Shore.