From a piece critiquing the Chief Justice's and Justice Alito's dissents in the recent Obergefell V. Hodges decision:
"The chief justice criticizes the majority for “order[ing] the transformation of a social institution that has formed the basis of human society for millennia, for the Kalahari Bushmen and the Han Chinese, the Carthaginians and the Aztecs. Just who do we think we are?” We’re pretty sure we’re not any of the above. And most of us are not convinced that what’s good enough for the Bushmen, the Carthaginians, and the Aztecs should be good enough for us. Ah, the millennia! Ah, the wisdom of ages! How arrogant it would be to think we knew more than the Aztecs—we who don’t even know how to cut a person’s heart out of his chest while’s he still alive, a maneuver they were experts at."
While it's true the Aztecs would not be my choice for a cultural touchstone, I would argue that given the right tool, a willing or incapacitated victim, and the willpower, almost anyone these days could cut out a living person's heart. The real innovation we've brought to the table is that given the right tools (again) and training, we can do this AND KEEP THE PERSON ALIVE. We can even put the heart back in, replace the heart, or put in a fake heart; then sew the person up and send them on their way to living quite happily for a long time. Just saying. We live in an age of wonders.
The article can be found here: http://www.slate.com/articles/newsandpolitics/thebreakfasttable/features/2015/scotusroundup/supremecourtgaymarriagejohnrobertsdissentinobergefellis_heartless.html