Rules are general guidelines, ands mods can interpret them for a given case. Nevertheless trying to discern whether plagiarism on a given case is intended or unintended is not necessarily something that I’d say is given much attention to.

Interpreting intention is not, in general terms, something that is going to be conclusive one way or another, so more often than not, the focus is going to be on the singular fact that plagiarism has been committed (by forum standards), that to second guess the reasons behind.

As I and others have reiterated over time, and due to this being one of the main causes for accounts being banned, a simple explicit well versed explanation above the posting textbox would not leave much wiggle room for complaints.