If the situation was such that there was only one learned lama or genuine practitioner alive, a person whose death would cause the whole of Tibet to lose all hope of keeping its Buddhist way of life, then it is conceivable that in order to protect that one person it might be justified for one or 10 enemies to be eliminated if there was no other way.
One has to try to develop one's inner feelings, which can be done simply by training one's mind. This is a priceless human asset and one you don't have to pay income tax on!
When ever Buddhism has taken root in a new land, there has been a certain variation in the style in which it is observed. The Buddha himself taught differently according to the place, the occasion and the situation of those who were listening to him.