Honestly alligators rarely attack full grown adults. If you’ve ever swam in freshwater in the South you’ve swam with gators. I’m not saying I would take the risk, but the odds of being able to get out of there are not terrible.
But the point wasn’t about it being effective. The point was the implication and the cruelty
It’s true the only reason the US didn’t go full Nazi in the 30s and 40s was we didn’t like how Germany was invading France and Britain.
Otherwise there was a lot of support for a domestic Nazi party leading to and ethnostate. Perhaps even over all of North America.