Let me explain here, as just one example. There was a tv show that was broadcast in the late 2000’s - early 2010’s. About 5-6 years ago, right when I felt nostalgic and wanted to watch it again, the tv show in question was pulled from all major streaming services, and DVDs of the show were not produced (or if they were, I was never able to get my hands on them). The only way that this cartoonish show was watchable for a time was via second-hand archives on YouTube, dailymotion, etc. However, despite the fact that the show was made inaccessible, the copyright holder’s official website states even to this day that the show is copyright, which means that unofficial uploads on YouTube should be in violation of copyright (the YouTube channels were just amateurish accounts and not credible, official accounts, just to be clear). As such, it was ambiguous as to whether the production company was going to lease the rights to the show. Whilst interest in the show has gone now, it did make me wonder: is it ever justifiable (either legally or ethically, or morally) to pirate media that has been completely pulled from circulation despite the original owner maintaining copyright (and therefore ownership) of? Or, is it (legally, ethically or morally) justifiable to pirate media where the copyright status is ambiguous (i.e. you don’t know if anyone owns it) [classic case study I always hear about: British PSAs, icons of 70’s 80’s and 90’s kids childhoods, yet locked behind copyright doors whose keys may lie in the hand of legal ambiguity]
Legally, no. There are some grey areas to be poked around in like orphaned works whose ownership is ambiguous or contested, but it doesn't sound like your problem falls into that category. The media company that made the show you're after still maintains copyright and legally controls every aspect of distribution.
Ethically is a much more interesting question. If you pirated the media you're after, an older work with no way to watch it legally, the creators aren't really hurt because you're not depriving them of revenue. Pretend there were DVD's to be had though, if you buy them on the second hand market the creator doesn't get a cut of that sale so who's really harmed? What if the new price of the DVD's was more than you could afford or justify spending? If you were never going to be a new customer, does that make it okay to steal since again the creator isn't losing anything?