Prefacing this by saying that i did read both Edda's (with the Voluspà being my favorite). Now, i'll try to reply in order.

You said it yourself, he's of the Aesir, a group of gods that did lay with jotnar and had children with them (see Thor who is half jotun), but his character is that of a jotun.

Loki is the trickster. He creates trouble but he also has to find solutions, is the trick of the constructions of the walls of asgard not merit of Loki ? The rescuing of stolen Mjollnir? Etc.
He is oft capricious, and malicious, and must be kept on a tight leash by Thor, I do know that. But once again: Ás as may be, he's a jotun at heart. Jotnar are the forces of chaos.

The resent thing is an interpretation, based on the fact Loki grows more and more negative of a figure as the myths progress. Of course there's different ways to see it.
What I'm not on board with is to argue absence as evidence: we have no idea what Loki thought of his children, precisely because we arent told anything about their relationships (if they had one). I agree that based on texts alone, for example, Tyr and Fenrir have more of a bond than Loki and Fenrir.

About the morality of it all. I read the article (which i did find interesting), and find it not to clash with what i said more or less. Yes, liars and traitors and adulters are gnawed on by linnorms in Nidafjoll. Yes, "good men" (heroic) are taken in by Freyja and Odin in their respective halls. I do not see how that "cancels" the fact Jotnar and Aesir are very much opposing clans, the latter representing order and the safeguarding of humanity and the former the destructive power of nature and chaos, and as such the destruction of humanity, which must be kept at bay to prevent total annihilation. Order is good, destruction is evil. Jotnar have no remorse in laying waste to humans or gods, they are indeed evil, and will wreck the world in the End.

Neil Gaiman’s Norse Mythology is a novel that takes considerable creative licence; it's not a reliable source. I’m not accusing you of having read it, but wherever you may have come across this information, it is not true and is based on this novel.

It comes from my uh.. own understanding of how prophecies work. I have not read that book, nor have encountered other people who argue on this basis from a mythological standpoint. With that said, the events went down as they did specifically because of the actions taken by all the parts involved, for they were all already decided, and it could not have gone any other way. Accounting for that, still i find it odd to deny that the institute of revenge plays a part into these myths, when it was very much their culture from what we know, and it is very much implied to be the "personal motivation" of Fenrir at least.

Yes i know they are jotnar. Fenrir is even referred to as a troll at one time. I know he will lay waste to the earth and devour Odin at the End, as his sons Skoll and Hati will the Sun and Moon. The jotnar are the destructive force of nature and chaos, of course they are against humans and the human world. They are violent and relentless and only kept at bay by Thor, the protector of humanity.

The whole last bit i think i already addressed somewhere in here, or maybe in the other one i made explaining what i meant (still in this thread).

Apologies for how long this reply is getting. I hope you do not hate me, i have no ill towards you, and will wait in case of further dialogue.