He isn't. But he's an excellent liar. He pops over to greet them.
"Well. I guess if we kill them instantly we risk a deadman's switch and if we don't we risk an escape. And it could take a long time to find him worldleaping. Ugh." And to Loki, "Don't apologize, I am just glad it was discovered quickly. I nearly murdered him and then I suppose it might have been a problem but I successfully refrained! For a decade. Once it's not going to be politically disruptive I still strongly favor causing him to stop existing."
"An evil one of my dad seems likely to be a lot less strategic and responsive to incentives than an evil me, yeah. Murdering all of them seems a bit much.
You also can't, just, put a version of my father on a low-tech planet and trust he'll never find a way to get out anyway... do we have any ideas?"
"Reasonable Valar sound lovely. Maybe we can find an Arda from before the whole mess started, reasonablize them, Melkor never gets paroled..."
"My pleasure." He does that.
"Do we have alts in the shadow vampire world, has anyone checked?"
"Thuringwethil's technically a vampire? Dunno if she really counts. She's not as pretty as you or I'd have had a harder time keeping Loki off her."
"And Loki spent decades in Arda - subjectively I think it was over a century - among Elves, who are I understand it not quite as hypermonogamous as vampires but enough so that they were lonely decades."