@gollum,
The Taliban have the power.
Think of the Mafia, do you think the restaurant owner wants to pay them protection money?
The Taliban are considerably stronger than the Mafia, because they have religion behind them which inspires fanaticism.
Tony Soprano didn’t have many suicide bombers working for him.
Many people in Afghanistan are poorly educated and/or illiterate. They rely on the Imams of the Taliban to tell them what’s in the Koran.
The Taliban don’t see themselves as cruel, they believe they’re carrying out God’s wishes.