Chemical Ali hanged: Remembering the gas attack on the Kurds

"Chemical Ali" is dead, hanged for his atrocious crimes against the Kurds, among his many, many crimes.
The Economist has this piece from its archives; excerpt:

EIGHT years of carnage have not robbed the Gulf war of its capacity to shock. In the middle of March (the exact date is unclear) Iranian soldiers pushed the Iraqi army out of the Kurdish town of Halabja, in the Kurdish part of north-east Iraq. One or two days later (this date, too, is unclear), the Iraqi air force appears to have responded by bombing Halabja with some sort of poisonous gas.
The Iraqis say it was the Iranians who bombed the town, a claim that contradicts the testimony of most survivors. The Kurds say that more than 4,000 people died, a claim difficult to verify. But western reporters and television crews, helicoptered into Halabja by the Iranians, found hundreds of corpses strewn around the town. Most were eerily unwounded, suggesting that they had been the victims of a quick-acting poison agent, possibly one of the nerve gases. Hundreds more victims, in hospitals in Tehran, had ferocious skin burns of the kind caused by mustard gas.

The first of the video clips of this PBS Frontline piece recalls the horrors of the horrendous gas attack that Saddam and Chemical Ali launched on civilian Kurds.  A couple of years ago I showed this in one of my classes, and students could not believe this happened.  Which was when one student asked: "why don't all these suicide bombers go kill all these tyrants instead of killing innocent people?"
Compared to what the Kurds went through, Chemical Ali died pretty painlessly.  I wonder whether he expressed any regrets at all before he died.