The diffences between tantric looping of tibetan and european "Buddhism" is a cultural. One takes the green tara as vehicle, one Audi. (and all the various schools). But by believing that phenomenas have a beginning and an end, they do not teach a way out, but give explainings of "reality". Tibetan might like to use the expression "believe" to give their horicont a name, European call it maybe "rationalising".
Caught in the "reality" of the 2. Noble Truth (of wandering on), not seeing the first, there is no interest to investigate the 2., search for an escape and even find the 3. realized. Why is that? Because its fine to perceive in frames of the secooud for them and even more fine that they can identify it as "their own culture". Which naturally of causes, seeks for growing...
So if you like to understand it, don't seek how to see for your self, they would not be able to explain it, the Aharahats or Bodhisattvas, but simply belive it, and it becomes true, with a beginning and an end.