Of course wildlife is not worse off - anywhere humans leave an inhabited area (ghost towns) you will see it gradually reclaimed by nature. If you want to argue

Of course wildlife is not worse off - anywhere humans leave an inhabited area (ghost towns) you will see it gradually reclaimed by nature. If you want to argue that radiation is healthy for mammals, you would have to compare with a similar unpolluted wildlife area, not with how wildlife fared when the area was a populous industrial city!