Yeah. If something doesn't seem to be working to stated goals, you should tweak the method not throw up your hands and give up. Conservation efforts can and do bear fruit with painstaking effort. Might seem like rolling that stone uphill endlessly but it's the job.
As you point out, there has already been an immense impact caused by humans. Like irreversible that's gone forever impact. We're already stuck in damage control and frankly should hold on to every inch we can. I scoff at carbon neutral propaganda and we plant a tree for every one we cut stuff a lot because often it's just greenwashing. Trees take decades to grow. Forests take centuries to mature. That doesn't go away with you planting random saplings. Sometimes those are even non native saplings. And that's not even considering the amount of animals chased away from clearing the areas in the first place. Those don't just come back like a video game if you plant the trees.
Also doctors and nurses can be anti-vaxxers. Basically, there are no jobs or professions free from the fact that there have always been dumb humans. Credentials just mean someone managed to pass the exams. Nothing more nothing less.
As a whole I still have hope for the human race but boy are we a self defeating species at times.
Another reason why DST sucks. Just pick a time and stick with it already.