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Wanna talk about media that literally describe the Doctor? Or even Doctor and the Master? Here:
I can't think of a music that fits War!Master, War!Doctor, Simm!Master (last sanction) and Twelfth Doctor better than this one.
However, the part of this music that most gets to me and makes me think about them is this:
So you wanna start a war?
In the age of icons?
So you wanna be immortal?
With a loaded gun on?
For me it portrays them on point because the War!versions, Simm!Master and Twelfth were all fighting - somehow - against the tyranny of Rassilon and of Gallifreyan's political structure as whole!
And the tone of the music - in my opinion implies that "the age of icons" isn't something inherently good. It is meant to signify that it's an age of "heroes". The word "icons" is purposefully chosen.
The Oxford language dictionary defines "icon" as "a person or thing regarded as a representative symbol or as worthy of of veneration" which in Gallifrey comes with power, position and poise.
The Master and the Doctor did nothing but demonstrate all of those three on the years following their departure from Gallifrey - in their own ways.
The Eighth Doctor & War!Doctor.
When the Doctor is called back he runs from war, yes. He is relatively young and doesn't have as many burdens as Twelfth does but he still afraid of what he might become. He knows the potential he has of becoming object of immense power to be wielded against the universe he loves so much. There is no doubt that they will, Gallifrey changed history of whole planets to have their "help" - aka time manipulation at its finest.
War Master
The Master on the time war might be doing unhinged things but he probably loathes himself for obeying the orders coming from the country that did nothing but reject him and, yes, his old friends from long ago. The Master knows how cold he can go to disassociate his actions in the name of Gallifrey from himself... until he forgets himself.
They both are forces to be reckoned. Aware of their potential and the damage they can do to themselves and the universe.
Call me crazy, but I don't think the Master wanted for the universe to prostrate itself on its knees for him this way. He is very autonomous and independent and most of all individualistic. He wants it to himself not to give it to Gallifrey.
On the other hand we have the post-war; Simm!Master and Twelfth Doctor which not only put to prove what they could do but - I imagine - went beyond what they thought capable of do and with this comes the disgust they must have felt at... everything.
I believe that once you go through something like this you can't really pinpoint what you are disgusted at, what or who you are angry at. You just are. You just feel.