Are UFOs demons playing mind games? Why would an alien travel for millions of light years to come here, for nothing??

"And war broke out in heaven: Michael and his angels battled with the dragon, and the dragon and its angels battled 8 but it did not prevail, neither was a place found for them any longer in heaven. 9 So down the great dragon was hurled, the original serpent, the one called Devil and Satan, who is misleading the entire inhabited earth; he was hurled down to the earth, and his angels were hurled down with him. 10 And I heard a loud voice in heaven say:
“Now have come to pass the salvation and the power and the kingdom of our God and the authority of his Christ, because the accuser of our brothers has been hurled down, who accuses them day and night before our God! 11 And they conquered him because of the blood of the Lamb and because of the word of their witnessing, and they did not love their souls even in the face of death. 12 On this account be glad, YOU heavens and YOU who reside in them! Woe for the earth and for the sea, because the Devil has come down to YOU, having great anger, knowing he has a short period of time.” Rv12:7