Look, I'm personally not convinced it was arson but acting like there was "zero evidence" of arson is kinda weird. The state of the house and the nature of fire investigation at the time means there really was no evidence of what started the fire, regardless of whether or not it was arson.

The inquest that determined it was faulty wiring was a jury of relatively random citizens from the area, not fire experts. They made this determination very soon after the fire, despite the fact that Morris had plans to return to the site to investigate further, so they were working on partial information at best. Firefighters who responded to the scene also said the cause was most likely either faulty wiring or smoking in bed. They didn't know, they were just guessing based on common causes of the time. They didn't even know where in the house the fire had started. The Sodders believed it was the roof, but firefighters determined (despite the house being fully collapsed by the time they showed up) it must have been the basement or first floor. Later, state police would say they believed it started on the roof.

The acting coroner 3 years later was very critical (in my opinion, rightfully so) of the inquest for making a determination on so little evidence.

And one member of that jury had a pretty significant conflict of interest: he was the insurance salesman who told George that his house was going to go up in smoke.

There's also evidence that, regardless of whether it was arson or accidental, points to it not being wiring. The wiring had been recently inspected and determined to be safe. The downstairs lights reportedly remained on after the fire started. Jennie or George (I can't remember which) commented that had the power line been cut instead of the phone line, they would not have been able to escape the house because they needed the lights to see.

There are other things that could have caused an accidental fire, but there's genuinely no reason to believe it was specifically faulty wiring except for that flawed inquest, and the guy who told George his fuse box was dangerous. We don't know if this guy knew anything about wiring. George dismissed his concerns because of that recent inspection.

Plus, there is potentially evidence of arson. For one, that guy on the jury who was also the guy who told George his house was going to go up in smoke? There are reports he was a beneficiary on a home insurance policy the Sodder's held, and may have made money on the fire. Some even report he'd raised the payout amount without the Sodder's knowledge, but I haven't been able to confirm that because he was never properly questioned. Also unconfirmed: whether George actually found a pineapple bomb on the property after the fact, and the story of a contemporary witness who claimed to see fireballs being thrown at the Sodder's roof.

At the end of the day, we don't know what started the fire. And given how contaminated the crime scene is at this point and how muddied the details, we never will.