What does that even mean? that cars on roads are not dangerous? or that power lines cannot cause problems?
I don't claim to know LA law, but a quick search found this (which sounds like most other states i am aware of):
Under Louisiana law, a tree owner is not liable simply because his tree falls and damages another’s property. Rather, someone seeking recovery for such damage must prove that the tree’s owner knew or should have known that the tree was diseased or otherwise “defective.” A tree owner is not under a general duty to become a professional arborist in order to diagnose a non-apparent defective condition of an apparently healthy tree. He must, however, take appropriate steps to evaluate the tree’s condition and to prevent damage through ordinary maintenance.
source