Regardless of moving goal posts, I don't buy this argument.
If we went back in the last century, they'd throw me in an asylum for being bipolar. Heck, I'd probably be forcibly sterilized due to the US being the first country to support and implement eugenics.
Violations of civil liberties in the US have always existed to great extremes.
I'm almost 100% sure that if you went back in time and showed them furry porn, you'd be thrown in prison. If you're lucky.