Earlier quoted context omitted.
It's unfair to judge them exceptionally when comparing among the range people and views of that earlier age, or to hide behind supposed earlier universal standards which often turn out to have been anything but. In the pantheon of world history it is perfectly reasonable to judge, question and doubt. Plenty of people of those ages found such things abhorrent and banded together to end child labour, animal mistreatmen…
It appears that Edison's involvement is a bit of an exaggeration: https://en.wikipedia.org/wiki/Topsy_(elephant)
The relevant part for people who don't want to search for it.