Making hypothetical statments about the motivations of an alien mind that may be millions of years ahead of us, and then using the implausibility of it as an ar

Making hypothetical statments about the motivations of an alien mind that may be millions of years ahead of us, and then using the implausibility of it as an argument to dismiss any contrary evidence, is the weakest argument against this phenomenon. But it is always repeated in every single discussion about this topic by someone!