It does always seem that way, for sure… but I don’t think that’s how it has to be. I keep thinking, if only we had a leader or leaders that can (help us) harness the anger and use it collectively for positive change - how much better off we could be.
I also think, in relation to the current times, perhaps the collective anger and outrage hasn’t been very wise all the time - but it has accomplished some good (like some cities reforming their police force, for example).
And I also think about people who feel like the only way to change a broken system is to burn it down. Maybe they are right?
At around the 4:00 mark Thurman starts talking about anger in the context of Buddhism and he goes into how the different schools of Buddhism address anger. He even briefly mentions Shantideva…
Thurman says,
“Mahayana would agree with the dualistic view of Buddhism that anger is no good”.
This sounds like the Shantideva quote you reference 
Thurman then goes on to say (roughly),
The Mahayana would also say the Bodhisattva, like the peacock who uses poison to be beautiful, the Bodhisattva can use the heat/fire of anger, take it away from the naive, mental approach where you become helpless (and lack all judgement), and use anger in a cool way, without hatred - take the anger away from the hatred, and cool-ly use force to improve a situation - in a loving way.
At around the 6:45 mark Thurman starts talking about Tantra and Vajrayana. He says,
In Vajrayana you go directly to the place where the heat of hatred and anger arises from. Its the place where you just don’t want to see wrong things, you don’t want harm and suffering to exist in the world. You will arise even in fury if necessary to stop it (if you are capable of that).
Thurman then says,
The problem with the un-enlightened person (practicing Vajrayana) or the person with no self-critical attitude is that they see something bad happening, they arise with fury, but then once gripped by the fury they add to the bad… They can’t control themselves when they’re playing with that fire/energy of pure anger, pure hatred.
Thurman rounds it out by saying,
But in Vajrayana, this pure energy can be used creatively…