Once when Drukpa Kunleg was on his travels, he saw how in certain monasteries there were many monks who loved meat and who bought it greedily from the butchers.

"This monastery," he said scornfully, "is a lair of wolves and so is that! It is said in the Shiksasamuccaya [Compendium of Instructions] that one should preserve one's body with medicinal food. This does not include fish and meat, for these are forbidden in the Lankavatara-sutra, where the Buddha declared that compassionate bodhisattvas should refrain from meat of any kind.
The Shiksasamuccaya also says that when the Vinaya stipulates that meat that is pure in the three ways may be eaten and should not be rejected, it does so to demolish the feelings of superiority of those who think that in refraining from meat altogether they are holding to the purest view. It is also a skilful measure for the sake of those who, because of their craving for meat, would otherwise be unable to enter the teachings, even though they have the karmic fortune to do so. This is also stated in the Lankavatara, which says that the teachings and precepts were set forth in a gradual manner as steps of a single path. Thus, the permission to indulge in meat, granted at the Pratimoksha stage, is proscribed in the Mahayana, in which even the eating of the flesh of animals that have died from one of the ten kinds of natural death is totally outlawed."

(Source: FB p. 84-85)