Ａct of God ｖｓ Act of Man

You are not responsible for Act of God, but you are responsibler for your own action.

Act of God:  how tree grows, how storm fell trees. 

Act of Man:  you were warned of the danger but did nothing.

总之，天下危险的事情很多，你要是连草木的事情都担心自己负责任，那么请不要买独立屋，一辈子住ｃｏｎｄｏ好了。