What kind of pipe dream are you having?
Oh.
You followed Odin into battle, slaughtering so many giants that, added together, their numbers nearly exceeded the populations of three planets. You helped your good father Odin conquer the World Tree Universe.
And then...
Odin sealed you away. Afterward, you regretted it and wanted to kill Odin. You thought that just because you regretted it, the Giant race would forgive you, a Death Goddess who shared their blood yet slaughtered them like pigs and dogs?
You must be dreaming.
The Giant race might have been a little honest and straightforward, but just look at the consequences when honest people finally became angry.
Ragnarok!
If Lake allied with Hela, the first thing that would happen was that the Aesir would be unable to eradicate their enemies completely. Lake absolutely could not allow such a thing to happen. He wanted to swallow the World Tree so that he could rule it himself, not so that the Aesir could one day make a comeback.
Besides.
Even Lake had to think carefully about the rage of honest people—the rage of giants.
What if he allied with Hela, only for the Giant race to mistakenly believe that their handsome, imposing God King Lake had betrayed them and begun flirting with Hela? What if they struck him with Ragnarok as well?
Honest people did not understand crooked schemes, nor did they understand compromise.
Simply put.
From a certain perspective, Lake was also an honest man, because the way honest people acted was just like Lake's: simple and crude.
I don't care what you're thinking. You killed my people, so you have to pay with your life. You allied yourself with a murderer, so you're his accomplice too. Sorry, Ragnarok curse warning.
If that really happened, who could