Who was John McCain, and what is this comic about?

The Guardian obituary confirms McCain died at 81 after brain cancer and describes his Vietnam POW torture and refusal of early release. Britannica confirms John McCain (1936–2018), U.S. senator and 2008 nominee, was shot down over Hanoi in 1967 and held as a POW for over five years enduring torture and solitary confinement before dying after cancer. The U.S. Senate profile confirms his Arizona Senate service until death in 2018, presidential nomination, naval service, and prisoner-of-war experience. His worth in this comic is the transformation of captivity and injury into public arguments about duty, torture, reconciliation, and civic obligation.

Sources
Page 1 of John McCain: John McCain: Hanoi Sky - John McCain is introduced as aviator, POW, senator, and a man whose public life began with a fall over Hanoi.
John McCain is introduced as aviator, POW, senator, and a man whose public life began with a fall over Hanoi.
Page 2 of John McCain: John McCain: Hanoi Sky - Shot down and badly injured, McCain is pulled from Trúc Bạch Lake and carried into captivity.
Shot down and badly injured, McCain is pulled from Trúc Bạch Lake and carried into captivity.
Page 3 of John McCain: John McCain: Hanoi Sky - The Hanoi prison cell compresses life into injury, hunger, interrogation, solitary confinement, and endurance.
The Hanoi prison cell compresses life into injury, hunger, interrogation, solitary confinement, and endurance.
Page 4 of John McCain: John McCain: Hanoi Sky - McCain refuses early release rather than leave ahead of prisoners captured before him.
McCain refuses early release rather than leave ahead of prisoners captured before him.
Page 5 of John McCain: John McCain: Hanoi Sky - After release, McCain turns survival into decades of public life in Congress, campaigns, and Senate argument.
After release, McCain turns survival into decades of public life in Congress, campaigns, and Senate argument.
Page 6 of John McCain: John McCain: Hanoi Sky - An older McCain returns to Vietnam and helps transform war memory into recognition and reconciliation.
An older McCain returns to Vietnam and helps transform war memory into recognition and reconciliation.
Page 7 of John McCain: John McCain: Hanoi Sky - His final illness and death in 2018 frame the legacy question: whether suffering becomes duty or poison.
His final illness and death in 2018 frame the legacy question: whether suffering becomes duty or poison.