Nice fanarts of Loki in his "Low Key" shirt. I'm loving all the fanart that is coming out of recently. Heh, nice boots
I wouldn't say it's easier for him to slide back into villainy but it's easier for others to take advantage of what happened, like Nightmare is doing. Nightmare is probably feeding off Loki's one biggest trauma and two biggest fears at the same time which are being eaten by Laufey which we know reading between the lines has effected him quite badly and he fears turning back into his villainous self that he is always destined for that. I don't think the promise of a happy ending stopped any of those fears and the other fear of everyone finding out what he did to Kid-Loki.
In a way this might be the most vulnerable we have actually seen Loki.