"Other forms of life didn't develop for a reason" isn't that convincing of an argument. We are somewhat knowledgeable about what chemical and physical processes can occur between, -100c to 1500C under 1atm or so, +-100 nanoteslas, in a timescale of under a human attention span. Beyond that, we become increasingly clueless.

We have only a single very specific data point. That, and the human tendency to opine confidently about that which we cannot know.