Individual Truth?

I was reading the book Beyond Good and Evil book by Friedrich Nietzsche over the weekend. It's a very difficult read for me but I did come across a little paragraph that made me think about the current events happening in the States.

"There are truths which are best recognized by mediocre minds, because they are best adapted for them, there are truths which only possess charms and seductive power for the mediocre spirits..."
- Friedrich Nietzsche

Doesn't it pretty much sums up what is happening in the U.S. with the division over the President? How is it possible for something to feel true to someone but not for others? Isn't truth universal?

"If you tell a lie big enough and keep repeating it, people will eventually come to believe it."
-Joseph Goebbels

Before saying that the quote above isn't true consider this: Hitler was able to convinced an entire nation that the Jews were evil and should be eradicated. Any rational mind knows the Jews aren't evil but Hitler kept repeating it to the populace until the majority came to believe it.
More recently, Trump kept repeating that he would build a wall and have another Country pay for it...

Truth isn't universal and people can believe pretty much anything if it's said just the right way and often enough. This doesn't only applies to Dictators but also to what we tell ourselves on a daily basis. I once heard Tim Marks, a speaker and author, say "Know why you believe what you believe" - ain't that the truth.