Pakistan supported The Taliban initially. Yes then later with the US bombings they turned against Pakistan. It's a very difficult situation for them as the Americans threatened Pakistan very strongly. They suffered a lot due to this. They should have never got involved with Afghanistan when the soviets came in.
I find it strange you take issue with this, it’s pretty much a statement of fact.
E.g. the following summary of the 89-96 period from David B Edwards’
Before Taliban:
Yes I think we do.
Because it's inscrutable and a half lie. The only notable faction shelling Kabul was Hetmatyar (And later Mazari who joined him), which was kinda inevitable after the ISI's plot to land him as successor failed. The ISI provided him both the rockets and the targeting. There was no 'various factions turning on each other' - most were attempting to find solutions (solutions that even included appearing Hekmatyar) . The other sides were essentially unified (I say essentially, though the term 'loosely' could be better used. Some skirmishes broke out with specific warlords looking to advance their own aims, but on the whole it was unified). It's a specific bad actor responsible.
For completion: It must be noted that Massoud and Dostum fired back at the rocket positions in the south of the city.
Timeline:
Mid April: HIG (Hekmatyar) starts to enter Kabul via south (Pashtun officials helping). NA (Dostum and Massoud) are negotiating via Peshawar for powersharing agreement post Najibullah resignation.
24th April: NA enter from North to prevent HIG taking Kabul
26th: agreement signed in Peshawar
27th: HIG mostly vanquished to the South of Kabul. However no security left and all minor factions now in Kabul and armed
May/June: HIG shell city from South. Shelling is indiscriminate and simply aimed at the city. NA fire back.
May/June: Ittihad and Wahdat conduct light arms fire in Kabul (basically skirmishing, trying to get rid of the other from specific areas of the city) - Shia/Sunni Iran/Saudi backed conflicts, looking for power in the new order. (Sometimes pulling others into skirmishes. West Kabul suffers. More terrorism than military but still...)
August: HIG get new weaponry from Pakistan, intensify bombardment on the city. Specifically targets civilians to increase pressure on NA
January 1993: Same again
February 1993: Wadhat (Remember Mazari from before) allies with HIG, shelling continues. Counteroffensive begins. 'Afshar offensive' - You can wiki this and there is conflicting information for sure; it could be argued that this constitutes a slaughter.
March 1993: Pause... ISI broker 'peace'
March 1993: HIG start artillery again.
Edit; Sorry
@Foxbatt - I think I originally intended to reply to something you said then forgot!