[throwaway316943]

I think it makes much less sense for aliens arriving by conventional means to not contact us. If they did then they’re being extremely generous by not attempting to colonize Earth or any of the other planets. It’d be like European explorers discovering the New World is inhabited and deciding to stay off shore. It also wouldn’t explain the anomalous, physics defying video and accounts of UFOs. On the other hand, if interstellar travel is trivial then there is much more leeway for taking a hands off approach. In that case we’re just the North Sentinelese and they’re the yachts and airplanes staying out of bow and arrow range.