Illegality is a meaningless term when the separation of powers is compromised specifically to make what would normally be illegal legal.

Or put another way: there’s a subreddit called something like /r/EmpireDidNothingWrong that puts forth the idea that nothing the Empire did in the Star Wars universe was illegal. In fact it was quite legal, as Palpatine famously says “I’ll make it legal”.

A fictional example sure, but if you can’t make the leap here, well, then you’re the one being disingenuous.