I mean, yes, I'm pretty sure "just take my word for it" is asking too much of LE.
We can always say "Come back with a warrant" but then sometimes they'll come back with a warrant.
> They should know what Tor is and know that any Tor server contains ZERO info
Unless, of course, one has misconfigured it... Which could be the case. Definitely the kind of thing LEO can figure out on the other side of a seize-and-strip of the hardware. Unfortunately, I think the only way to not be a part of the story here is to not be a part of the story here... Don't proxy anonymous traffic if you don't want law enforcement asking after the anonymous traffic you proxied. Otherwise, expect the responsibility imposed upon a service provider (since you're providing a service).
Other ISPs avoid this scrutiny by going out of their way to be helpful to law enforcement.