Except in realityit seems he was against the elephant being killed but said electrocution would be more humane than the hanging which had happened to ‘murderous mary’, his opinion being something the aspca also supported.
The assholes in this story are the themepark owners that upon being unable to sell Topsy decided to kill her as a spectacle to gain publicity, A previous attempt elsewhere to electrocute an elephant had failed so they also used other measures. They poisoned her. Electrocuted her and strangled her with a steam powered winch.
They did use locally supplied power from the Edson Co but this was because it was a decade after war of the currents and Edison was the main supplier of AC to NYC, they certainly weren’t trying to promote its danger. Plus he no longer owned that company, he’d sold to GE and it still used his name.
The Edison film company did film it but again no evidence the man himself was involved, they filmed short clips of specticals and news events which could be viewed in a slot machine. It’s upsetting but people were a lot less caring about animals back then, it wasn’t especially shocking that this happened or was recorded.