That is a very human-centric viewpoint and a very strange one at that. It's almost egocentric.

Were big cats such as mountain lions and bobcats not robust enough in America? Because they've been eradicated due to habitat loss.

Is it really a surprise that animals that have evolved over millions of years to fit within the balance of nature are having difficulty adapting in just decades to humanity's technology destruction of that balance? The fact that some are able to make it through that imbalance is not a justification.

It's weird that you basically seem to blame evolution.