We don’t know that. That’s an assumption. After all, he’s more than happy to destroy pieces of Elbaf for the sake of proving a point.
And, not everything has to be taken at a face value... right? Context matters.
"What we consume, Shapes us"
His past reflects how badly he was mistreated - shame of elbaph, curse and perhaps WG is behind the king's death but Loki took the blame.
That's what shaped him.
Once he will get redeemed, I am confident we will see somewhat different Loki.
And, nika has keen observation of feelings....
Robin's case is classic example.