<i>> "In fact, there should be a quadrillion ‘Oumuamua-like objects within the solar system at any given time, if they are distributed on random trajectories with equal probability of moving in all directions."</i><p>There is always the possibility that we only observed a very, very rare event. Just by enough very rare events being possible, it is bound to happen that we observe one of them one day. All in all it just reminds me a bit of p-hacking/data fishing.