Just because we can imagine something doesn't make it at all possible. We're speculating the probability of something having seen it occur once...
I certainly agree that our dataset, re: "life as we know it", is horribly limited. Likely to the point of uselessness. But hypotheses are the foundation of any science, after all, and what little we do have to go on suggests that competition/predation, rather than cooperation/symbiosis, may be a more reasonable expectation.
But perhaps not. In which case, we'd be very lucky to encounter such an enlightened species.
But now your also scared of storms :)