Regina Rini of the Philosophy Department at York University in Toronto addresses the nature of truth:

Most philosophers will tell you that truth is their goal. They want to know the truth about Knowledge or Existence or Justice. I’m sure this is—but I conjecture that ‘truth’ is only an instrumental goal. What these philosophers really want, I suspect, is certainty. They want to hold aspects of the world finally fixed in their minds, to make it the case that they cannot be wrong, at least about certain things. In service of this aim, they will jettison areas of inquiry about which certainty seems impossible. Hence, their category of the philosophical excludes the empirical, the accidental, and the historically contingent. What is left are the necessary truths—those that can be known to need to be true.

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Many people do want certainty, but philosophy is not where they will go to find it. Religion, of course, is an ancient and numerically dominant certainty-provider. But a sense of certainty can also be found in political ideology. Or, increasingly, in science. Philosophy is trying to compete in the certainty marketplace, and it is not winning.