In the build-up to 'the millennium' there was a rising interest in eschatology and angelogy, both in artistic media and in scholarship. Your poems of alien visitation seem reluctant to treat this tendency ironically, which one might perhaps expect. But on a personal, or intimate level, it seems bigoted to me to lampoon or mock people's personal hopes or beliefs. I respect it. Visitors will always be coming.
Millenarianism has many faces.
The oppressions of the human condition are a guarantee that the visitors will be just round the next orbit. It's easy to come up with trite answers to this. The inevitability of death is the key. That despite the willingness to face death, be absorbed by it, enter into necrophilic liaisons with it, there's the hope of something better on the other side. It's purgatorial suffering.