you said yourself the sequence was insignificant, so i assume it would be hard to infere any context. either way, on tpb there is context. A pointer into pi is just a minor difference in encoding. As said in another comment, intent matters - as much as I dislike the pressumptions made about the intent. Law philosophically, for lack of better words, difficult questions of morallity arise and are indeed significant. That includes conciousness about the consequences, which is why this topic is debated at length, because everyone has a stake in it. That's a lot of context.

OTOH assume knlowedge of nothing but the magnet link list torrent file, if you just downloaded the linked torrent files without to procede to download when in doubt about copyright infringement, that woould not be careless.

Your argument extends to how can any string of data be illegal, putting copyright into question, but that's a different debate.