Can’t get over Mark’s outie seemingly not phased by being an accessory to murder?

I’m not a huge fan of the Reghabi storyline - it’s hard to understand why Mark trusts her so much, even before learning he could potentially see his dead wife? Also, I feel like they haven’t explained enough on how the science of her reintegration experiments with Mark work. Obviously the show as a whole isn’t true science, but this arc just feels a little too “just believe it!” to me - also Cobel lives next door, but doesnt actually monitor people going in and out if Mark’s place 24/7? Seems like a simple camera could do.