On a physical aspect of things, yes, it is by "nature" that these natural disasters occur such as the earth's plate structure shifting, or a underwater earthquake, and etc. However, we must see all things, even the events and natural disasters that occur in this world, on a physical aspect AND what is written in the Word of God. The reason for these natural disasters and chaos that are happening around the world is not solely because of the "stupidity" of mankind, but that it is God's judgement TO mankind. Even though Jesus Christ had died for all our sins, we are still entitled to recieve the retribution for our sins for it is written in Hebrews 10:26-28, we will receieve judgement if we continue to sin even after receive the knowledge of the truth. So I agree with your point when you says that at times we are quick to blame God or Satan for these results, because most of of the time, it is man himself that cause these disasters to befall.