The thing is, there is no guarantee that by doing nothing things will be better than by doing something. We no longer believe than nature is somehow an eternal system that humans disturb. We know there have been huge catastrophes before without any kind of human intervention.
The only good thing about doing nothing in principle is that when something bad happens there's nobody to blame. Of course it may be the case that we have good reasons to believe that doing nothing is always safer than doing something, but we need some data and some models to support that belief, it's not enough holding it a priori just because many people still believe in "Mother Earth", even though they consider that "Father God" is dead.
The only good thing about doing nothing in principle is that when something bad happens there's nobody to blame. Of course it may be the case that we have good reasons to believe that doing nothing is always safer than doing something, but we need some data and some models to support that belief, it's not enough holding it a priori just because many people still believe in "Mother Earth", even though they consider that "Father God" is dead.