> the vajrayana schools (mainly tibet) also claim that there is clarity and
  > energy in this emotion

That's probably because Tibetan Buddhism became a tool of political domination.

The earliest Buddhist records explicitly recommend suppressing anger, even by sheer force of will if necessary (but only as a last resort.)

  If evil, unskillful thoughts — imbued with desire, aversion or delusion —
  still arise in the monk while he is attending to the relaxing of
  thought-fabrication with regard to those thoughts, then — with his teeth
  clenched and his tongue pressed against the roof of his mouth — he should beat
  down, constrain, and crush his mind with his awareness. As — with his teeth
  clenched and his tongue pressed against the roof of his mouth — he is beating
  down, constraining, and crushing his mind with his awareness, those evil,
  unskillful thoughts are abandoned and subside. With their abandoning, he
  steadies his mind right within, settles it, unifies it, and concentrates it.
  Just as a strong man, seizing a weaker man by the head or the throat or the
  shoulders, would beat him down, constrain, and crush him; in the same way, if
  evil, unskillful thoughts — imbued with desire, aversion or delusion — still
  arise in the monk while he is attending to the relaxing of thought-fabrication
  with regard to those thoughts, then — with his teeth clenched and his tongue
  pressed against the roof of his mouth — he should beat down, constrain, and
  crush his mind with his awareness.

http://www.accesstoinsight.org/tipitaka/mn/mn.020.than.html