Why did Kabul fall so easily into the Taliban's hands?

They came, yes, the Taliban came at last, the vampires to drink the human blood, they are still thirsty though they have spilled too much blood for the past 20 years but it seems not enough. 

People were expecting this calamity but no one expected it to such a degree that overnight everything fell apart. The political turmoil in the months of May and June featured a doomy future. It became a reality in July when the Taliban's offense metastasized across the country. This catastrophe should be blamed on the stubborn and arrogant Afghan president, Ashraf Ghani, who did not want the army to take the offensive.

I heard Biden saying that the Afghan Army did not fight. That is not true. How to fight with your hands tied? The decrepit old man who was an illegitimate president and with his fascist team did not allow the Army to fight the Taliban. Most of those generals and senior ranks of Afghan forces who wanted to fight were ousted or replaced with lower rank officers. In some cases, some generals faced mandatory retirement like Lt. Gen. Murad Ali Murad. In the past two years, nearly 35 generals were forced into retirement.

Now they are trying to explain why the Afghan central government collapsed. Well, if anyone followed the events evolving in the past three months, it was certain that the government would collapse eventually, only the narcissist leader, Ghani, stubbornly refused to believe it. He intentionally did not allow the army to fight against the Taliban and when they asked for air support, they were left alone to die at the hands of the Taliban. This gradually eroded the morale of the Afghan Army fighters. 

Not only Ashraf Ghani did not allow the Afghan Army to fight, but he and his team in the government suppressed popular uprisings against the Taliban. So, any local resistant groups from non-Pashtun that stood up against the onslaught of the Taliban, Ashraf Ghani's government considered it a threat, but ironically, not the Taliban who were inching close to the capital as districts after districts and provinces and provinces were falling to the hands of the Taliban.