The problem with that is their perception is a static view of nature rather than understanding that nature itself is always changing.
You are exactly right! Their perceptions of what the natural world is like are downright strange, many of them are urban and not spent much time in the natural world, and many others have lived in rural areas but moved so often they don't realize a tree can mature AND DIE within their lifetime.
One of the environmentalists at our own local "conservancy" group, as part of a discussion on putting trees along stream, took off on a little rant about how "there is no reason, absolutely NO REASON, that there shouldn't be native brown trout there" about a section of the creek that hasn't ever been known to have brown trout - it's been KNOWN to be an intermittent stream. Nonetheless, she sits in her office with her vision of how each stream and forest SHOULD be, and writes up government grant applications to get money to make it that way.
Many communities around the country are getting "natural heritage surveys" done, since various levels of government are paying for it. They don't realize that the impetus behind the surveys is to develop data to use to show what needs to be done to get to the 'right' mix of species - how many deer are appropriate, how many squirrels, how much poison ivy, how many snails and skinks, so they can work toward 'restoring our natural heritage'. Unlike the people of the worlds great religions who recognize a power greater than themselves, these people think they have the ability and the obligation to put everything in nature to rights. They are Gaia worshipers, but they don't think Gaia is more powerful than they are...
There is not a single living Brown Trout in the entire state of Mississippi. They must have got an early start on global warming.
Except that brown trout are "native" to Europe and not North America. At least since the last ice age.