When speaking about the concept of truth, it is important for an audience to understand what that word refers to. In my mind, there are two distinct concepts embedded in that word.
The first is somewhat adequately defined as "facts." The truth (lowercase "t") is a collection of general information about something real and quantifiable. Science seeks the "truth" about or universe through objective, empirical study. It collects and chronicles present and past instances of real events in support of a general theory of the parts' connection to each other.
The Truth (capital "T"), however, is not to be confused with his general theory, which is—after all—only a theory. The Truth is maddening to logicians and intellectuals because, by its nature, it can never be completely known or captured at any instance. It appears fluid because it has a broad application. In reality, it exists as unshakeably as the laws of physics.
Of course, religions claim exclusive ownership of Truth. Also, in many cases, nations or peoples claim this ownership. Even organizations (from legitimate to criminal) claim this ownership before their constituents. Indeed (and ironically), much blood has been and continues to be shed over the ownership of Truth. Yet Truth is bigger than religion, government, and the marketplace, the first informing the others. No man gets to decide what "Truth" is, only what "truth" is.
Throughout human civilization, those in power have sought to do a number of things using the Truth as a means to an end. Some seek to enlighten by attempting to expose the Truth, but the masses habitually remain focused only on what they can see. Others seek to control the masses by propagating a singular view of the Truth. No matter how monstrous or angelic the plan, the goal is nearly always to make the world a better place. The question is, better for whom?
There are two poles to the use of Truth as a catalyst for a better world. The first entails Truth being taught through a broad discussion, as with the Liberal Arts. People study the greatest ideas from all of human history in order to seek for themselves the best understanding of Truth. The other entails a scholar or "expert" building his own understanding (faulty or true) into a singular edifice for the masses.
The result is that only those willing to dive into the Liberal Arts ever acquire true perspective. Everyone else is encouraged to take the expert's word for it. However, the expert is not you, does not share your problems or passions, and ultimately cannot help you like you can when you have perspective. And so, people make do, and fail. Instead of making the difficult dive into the Arts, they latch onto a truth—that is, a prepackaged way of being—that most resembles their current lifestyle.
It's not that people don't believe in Truth, it's that they don't want to believe. Truth is obvious when it is simply laid out, but it may suggest the need for a change in lifestyle for many people. Since this can be painful, and since suffering is not in keeping with a better world, those with the means tend to deliver "solutions" to ease the suffering.
As with physical training, there are ways to work up to the heavy material. However, no fitness coach would be worth his salt if he helped you avoid "the burn"! And no FITness coach would be either if he let get by on half-baked ideas!