Apply System thinking in a great tragedy

[PhilGR]

 Huge physical disasters happen all of the time around the world , and most of the time with a lot of damage and people dead. Some of them are made by mistake or from a physical disaster (maybe caused by climate change). What should a actualized person think about that , how to apply system thinking? Many people feel bad for a while and then forget it, I disagree with that reaction, what do you think?