For your interest; the possibility of vast alien megastructures blocking the light from the star KIC 8462852:
https://arxiv.org/abs/1509.03622
https://www.youtube.com/watch?v=gypAjPp6eps
https://academic.oup.com/mnras/article/457/4/3988/2589003
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.