>>16895
You might be able to get away with it if you pretend that the star has some kind of cyclical variability: periods of increased starspots and periods of increased flares that oscillate on an ~six- Earth-month cycle.
The real issue is that the conditions that enable a planet to harbor intelligent life is a FUCKLOAD more complex than just "has an atmosphere" and "is the right temperature for liquid water".
You have to consider really subtle factors like the Earth's large moon; its formation via giant impact gave a tilt to the Earth creating the seasons, and slowed the rotation giving a reasonable day length, and its presence provides for tidal motion and nocturnal lighting as well as a lunar cycle. A planet this size with a moon that size is not very common: most rocky planets will have no moons or teeny ones like Mars.
There's also the influence of Jupiter, which keeps giant asteroids and comets from hitting Earth and causing mass-extinctions all the time. A little smaller and it doesn't do a good job; a little bigger and it becomes a second star and everything in the system is toasted. But a planet that gets a mass-extinction impact every few million years isn't going to evolve shit.
There's also the presence of certain elements and compounds. How fucked would technology have been if there wasn't a lot of silicon in the crust to make circuits with? Would humanity even have left the Stone Age if there wasn't iron lying around everywhere? What about the huge reserves of coal and oil that powered the industrial revolution? What about radioactive elements, the presence in the core of Earth which helps create the magnetic field that keeps the atmosphere from being blown away and creates tectonic activity? Can heavy elements like that even be attracted by a star as small as a red dwarf and thus end up in the planets that form around it? I kinda doubt it. Without the magnetic field, Earth would be exactly like Mars: geologically dead and mostly airless.
It's my educated opinion that life probably exists all over the galaxy, possibly in every single solar system --- but only on the level of bacteria and perhaps some protists. But intelligent life, like humans? Probably only a few in the whole galaxy, if that. The number of factors to take into account would turn the Drake Equation into something that would fill a blackboard, and return a result that looks like one in a googol.