I have always felt that the "what humans do is natural too!" argument is a massive cop out and totally understates the massive destruction that humans are a part of.

Your analogy misses the mark by a long shot, and I would say that it's totally irrelevant except that it actually supports the opposite of what I think your point is. Beaver dams, like almost everything we find in nature, sit within a carefully evolved and evolving balance. Beaver damns actually generate and create thriving ecosystems, including benefits for other species, when viewed from a perspective other than a human one. It's only humans that find beavers a nuisance. What humans build does not add to a balance but rather provides an imbalance.

There is no reason to believe, that I know of, that highways and city building, for example, support or diversify or catalyze or <whatever> the ecosystems that they replace and neighbor in any sort of holistic manner. There may be small wins for a very small subset of animal species, but other than that it is destruction and displacement of habitats. Just imagine the next time you're on a highway, even out in the country. Monitor the road kill that you see or the bug splashes on your windshield. They're killed by technology they don't understand while trying to cross a habitat they once crossed freely that is now separated by large swaths of concrete and impassable barriers. Think about all the animals that literally have huge lines drawn in between areas they once roamed. Then notice all the fences, cut grass, buildings, and more that are there and increase in density as you get back closer to the city. All the birds, insects, mammals, and other animals that once inhabited those areas have to go somewhere, or they die off. Now they get condensed and dispersed into areas of tighter competition for resources, all the while still being pushed out by humans in more and more creative ways. There is nothing about this that increases the diversity of ecosystems that once were. It decimates them, literally.

I encourage you to go to a remote place and just notice the area absolutely teeming with varieties of flora and fauna. Then imagine a road there, a house there, etc. and realize what would happen to all that there is there. Then multiply that destruction, degradation, and displacement by the size of human habitats.

Do you know why bat houses are so effective and encouraged by state governments and conversation groups? It's because humans have destroyed and taken over habitat areas for bats, and they struggle to natural find places to call home.

https://www.mass.gov/guides/bat-houses#-why-are-bat-houses-i...

https://www.nps.gov/subjects/bats/habitat-loss.htm

So again, your example supports the opposite of what you think. The fact that bats show up so readily is that they are struggling to find other suitable areas that used to be there.

I would encourage you to think about things from a different perspective when you are out in the "nature" that humans have built. Would you like if another species or even a human bulldozed your house and then built you a little tent to live on a corner of your former plot? Would you call that a "win"? Would you like it if there was, for all intents and purposes, an impenetrable wall or walls built between you and grocery stores and separates you from your family and friends?

What humans have done may be "natural" in a very general sense, but it is almost entirely self-serving. There are clear reasons why extinction rates have gone up and there are countless stories of species struggling more and more in the past 100-200 years.