The second round of peace talks for Syria have now collapsed. The killing of 100,000 people and the exodus of 9.5 million people from their homes has not been sufficient reason to end the war in Syria or to restrain the barbarities with which it is being fought. This double failure will accelerate the death toll.
To put this into context, the conflict which decimated Afghanistan during the 1980s when the Soviets entered and kept the matter out of the hands of the Security Council for a decade cost about one million lives. The conflict in the former Yugoslavia in the 1990s consumed 100,000 people and would have been much more had the Security Council not intervened.
The Security Council is very unlikely to intervene in Syria because of the veto of both Russia and China. This war in Syria will now bleed out as three sides fight for total victory. The three sides to this equation are Assad, the moderate rebels, and the extremists fighting a jihad. Without international intervention, the human price in this conflict could easily match that in Afghanistan in the 1980s.
This triangle of opposing forces is the reason why the peace talks failed. The moderates are only a fraction of the opposition and although they want to transition to democracy and allow the rules of war to apply, there are both inconsistencies and significant limits on the influence they have on the ground.
The Assad regime have no intention of relinquishing power, because they believe that a firm hand is necessary to keep order and stability in the country. This is something they believe free and fair elections cannot achieve. They like to fight what they see as terror with reprisals which are illegal in international law. Assad's totalitarian view is directly from the worst parts of the 20th century.