First, the link is broken.

We don't need to use the Earth for the cosmic ray argument. In fact, it's best if we don't. What should we use? White dwarf and neutron stars. These have a density that makes runaway processes exponentially easier (and I mean that 'exponentially' literally, and it also applies figuratively). They have not collapsed into black holes or strangelet soup either.

Also, we aren't anthropically dependent on them the way we are on Earth itself.