Robert Maxwell wrote:
if intelligent life roughly fitting the parameters, capabilities, resources, and interests of human beings was at all common in the universe, how come we've never seen any evidence of it? Likewise with FTL travel. If it's possible to travel faster-than-light and it requires a level of technology that we can conceive (meaning alien civilizations capable of it should be ubiquitous), we should be getting visitors all the time
Just because alien civilizations can visit us doesn't mean they would ever want to. What is there about Earth that would be worth visiting? Any alien culture which could get here would, almost certainly, consider Earth too primitive to bother with.