Even if bluntness only equals useful truth for a minority of times, it is still worth it.
Truth is a rare and important commodity, much like gold is. You would not throw away a mineral that has "only" a few per cent gold as useless, only because non-gold forms the bulk of it.
My point is, the most valuable insights regarding myself and my behavior came from people who were willing to be blunt with me. I would be a worse person today if I never heard some of the observations that made me swallow hard and even get angry.
Truth is a rare and important commodity, much like gold is. You would not throw away a mineral that has "only" a few per cent gold as useless, only because non-gold forms the bulk of it.