People need to keep in mind that Mike Hoffman may not understand IP and Mac addresses, he also may not have seen the same evidence that the Karlsson's presented to both the team and the Justice Of The Peace. I am not a legal expert....far from it, but I can't imagine it makes much sense for the Karlsson's to show the offending parties fiance the extent of the evidence they have against her.
Assuming she did do the alleged crimes, it might be a dynamic where considering she is his partner of a decade or whatever, and he trusts her, he's taking her word for it because he doesn't know better, and if during the legal process indisputable evidence comes to light, maybe he changes his tune from 150 percent.
Look at it this way to those married who trust their wives, if they told you they 150 percent didn't do something, maybe even spun a tail about being set up, etc, etc, and you had no reason to believe otherwise, would you take their word for it and stand by them?
Obviously, I'm speculating, which I'll probably regret.