I absolutely can make a statement that as things stand now, something is illegal, while also mentioning that there may be value in discussing whether it should be legal or not. Here's another one: According to federal law (of the USA), recreational marijuana use is illegal. So anyone that smokes weed for fun (in the USA) is breaking the law, and that's a fact. But there is a separate discussion that we should have about whether we should legalize recreational marijuana use. I didn't take a position on the issue, but I do support at least having the discussion.

I also did not claim that PopCornTime has a moral responsibility, I said that using clever phrasing doesn't make something illegal into something legal.

It sounded like a moral argument to me, but I'll take your word for it that you're making a factual claim about the law. What law exactly says that they "they bore some responsibility" for other people's copyright violation?

As an example, the federal murder-for-hire law is what specifically establishes legal culpability for your not-quite-analogous example: https://www.law.cornell.edu/uscode/text/18/1958