For several reasons. One is it is kind of a metaphor for how religious people seem to think about "truth." They think that they have the one truth, the only tr

For several reasons. One is it is kind of a metaphor for how religious people seem to think about "truth." They think that they have the one truth, the only truth, as ordained by their spirit entity, like Zeus, Ishtar, Ra, or JHWH (the christian god). That their "truth" is the answer to everything. Like in the christian god-entity, people can walk on water or bring dead people back to life. That's part of the TRUTH. Personally, I prefer to use the words "facts" and "evidence" rather than the world "truth", because truth is a very generalized and abstracted concept that can have many meanings and make conversations muddy. If one is saying 1+1 = 2 is truth, and use the word that way, then ok. But usually that is not how the word is used. It's kind of an amorphous term. Also, it kind of makes me chuckle to write it that way because if you see religious people write or comment, they always use all-caps when they write, in the weirdest ways. So it is mimic of them to some extent. Not just on that word, but all kinds of random words in all-caps.