You really missed the obvious; Luthor was not jealous of power in that way, but of an alien being considered a "god" by some of the population--a "god" who has every advantage to alter the destiny of humanity on a whim, yet in his mind, is no benevolent Lord, but an alien who has been just as destructive as he's been helpful, and there's no human authority to stop him (including congress), and what he saw as a negative effect on humanity's self-worth overall. He references this more than once in the film, and it consistently mirrors the hatred of Superman exhibited by Luthor in endless comics and animated productions of the past.
He's level headed, so he would not see Clark as "people" but an overwhelmingly powerful alien force, which in the big picture, Superman is and always will be, no matter how much he tries to assimilate.
Up to that moment, Superman's first encounter with Batman was to threaten him, asserting how he could kill him if he so desired. Not anything close to a "how do you do, pal?" but Superman proving he's a serious threat to humanity, which is the tragic part of his MoS - BvS journey, since he privately tried to be like humans, but his own instincts (and acknowledgment of his Kryptonian abilities) prevented him from shedding the "alien threat" cloak draped on his shoulders.
BvS established that she was not in a loving frame of mind at that point in modern history, That's beyond question. Her WW "love" VO is also about her present day beliefs (which the framing scenes lay out) which were shaped by her contact with Batman and Superman. Until that time, she abandoned that after the war.. .