The Soviets didn't airdrop food packets, they dropped mines. The Soviets didn't build schools, they destroyed them at random and without remorse. The Soviets didn't bring hope and promise of a free and peaceful existence to Afghanis. They brought death and destruction on a scale only recently rivaled by the Taliban. The only similarity between our involvement in Afghanistan and the Soviet invasion there is the brutality that was imposed on its people. In the Soviet's case it was a means to and end. In our case it's the beginning of the end to those means in order for freedom and stability to flourish.
You see, that's the beauty of moral equivalence. It eliminates the need for all that nasty, laborious thinking.