What's more important, why it happened or stopping it from happening on a regular basis?
The logic of tyranny. Why people resist doesn't matter - all that matters is using more force to defeat any resistance.
Works for, say, Pinochet in Chile - everyone knows if you resist any of the corrupt policies and exploitation of citizens, you will be 'disappeared' and tortured.
Just do that, and don't consider actually doing anything about why they're revolting.
Al Queda could be murderous religious fanatics without a reasonable agenda.
But as one, they were able to USE the 'legitimate grievances', the resistance of the people to wrongs, to have more support than they would.
They weren't very good at it, and the Muslim people largely saw through their trying to use other people's issues, like trying to use the 'Arab Spring'. Al Queda was pretty limited where they could operate. But the Taliban can operate pretty freely with popular support, and the approach of the quoted poster drives more and more citizens who have been wronged by that approach into the arms of the resistance.
That approach of the quoted poster has been used a lot; for example, Egypt had no shortage of police state measures and torture for resisters.
As that poster would say, what's more important, why the Egyptian people are revolting, or preventing them from revolting? Call out the military! Kill them!
Except the military did not take the orders of Mubarak to 'prevent more revolting', and we all cheered the people being able to get rid of a tyrant.
One the poster I quote above would have kept in power, asking how to prevent the revolts, not why they happened.
He think 'why it happened' doesn't have to do with 'preventing another one'. Sometimes it does. Not always - Al Queda might have tried to do that for things that aren't ones to address, trying to stimulate western-Muslim conflict - but it doesn't hurt to find out what the people's protests are about. Other times it's Mubarak's Egypt. But other times, the military doesn't refuse to take orders to use force on the citizens.
The quoted poster doesn't seem to care about that, about the people oppressed. No wonder regimes like Mubarak could keep power for decades. Or Marcos, or Batista, or Somoza, or the Duvaliers, or the Shah, or the Ayatollahs, or Pinochet, or El Salvador's tyrants, or Honduras' tyrants, or Apartheid, or the Chinese communists, or the USSR's shield states, or Africa's tyrants, and on and on.