There is 2 sides to this and I think some people are forgetting about it. The incident vs the environment.
Lets say the first SUT incident happened while sunny, warm, not a cloud in the sky and perfect conditions.... We would have never seen a SC while the crane went to retrieve SUT's Sauber. IF BIA were to hit the crane during perfect conditions, the blame would have been mechanical failure, driver error, act of god, etc..... the blame on the FIA wouldn't be there or not nearly so scrutinized
Now that we have a completely different environment, I think the FIA needs to adjust what deems a SC under what conditions and stick to it. I hate how they almost evaluate the situation then decide, not just do it.
If ideal conditions (sunny, no cloud, etc..) and a crane has to retrieve a car w/ marshals.. Double Yellows and call it a day (unless something outstanding happens)
If unideal conditions (rain, impaired visions, clouds, etc...) and a crane has to go retrieve a car w/ marshals.. SC every time. Its just common sense safety for everyone and anything.