Planets that are in the sweet zone, orbiting a "safe" steady-state star, are probably in some abundance.  The ones with an ideally sized and distanced moon, which contributes so much to the possibility of life starting and thriving, are probably rare.  The ones that also have gas giants which sweep most of the comets, asteroids, and other dangerous things away, are probably even more rare.  The ones that have been just plain lucky, for life to have actually started, and survived any period of time, are probably very, very rare.  The ones where intelligent life has evolved are probably an anomaly.  Judging from our presidential race, between Trump and Clinton, perhaps non-existent.