yes. you cannot control an avalanche, serac fall, rockfall, sudden storms etc. you can only be aware of such conditions developing and attempt to minimize your exposure to them. if this means going home then do it. the only problem is if conditions take a turn for the worse when you are already committed you are screwed.
i was reading twight's exteeeem book and my room mate asked me what i thought of it. i said it was pretty inspiring and she said "I don't support it. I think someone's gonna get killed." of course she was a sport climber but you get the drift...