Are We Alone in the Universe? By Brian Simpson
For your interest; the possibility of vast alien megastructures blocking the light from the star KIC 8462852:
If this is evidence of advanced alien life, then they must have solved the problem of how not to destroy themselves. Perhaps they channel their aggression into destroying other civilisations as in this forthcoming movie representation, Predator (2018):
Oops, this clip is far too violent for me.