That's quiete a leap there. True, there were a lot of politics in Tibet, same for all the other buddhist countries. But to counter your point: anger is probably best surpressed if you want to easily dominate people.
Your sutra is from the theravada traditions. The vajrayana tradition is not recognized by the theravada tradition, the vajrayana does recognise the theravada sutra's, but in vajrayana there are a bit more tools for dealing with disturbing emotions. How that came to be is a discussion on it's own.
The method in your passage is recommended often as a last resort in these schools. So I'm not claiming you should let anger run it's free course, definitely not, better there are other ways of dealing with it.
Your sutra is from the theravada traditions. The vajrayana tradition is not recognized by the theravada tradition, the vajrayana does recognise the theravada sutra's, but in vajrayana there are a bit more tools for dealing with disturbing emotions. How that came to be is a discussion on it's own.
The method in your passage is recommended often as a last resort in these schools. So I'm not claiming you should let anger run it's free course, definitely not, better there are other ways of dealing with it.