The Ethics of Speculation Clearly Labelled as Such
Launch library · evergreen read

Speculation has a legitimate place in evidence based writing, particularly when a gap in the record genuinely needs some form of bridging for the story to make sense, but it only remains ethical when it is clearly and consistently marked as speculation rather than fact.
Phrases such as it seems likely, one plausible explanation, or the evidence suggests but does not confirm all do real work here, keeping a reader's confidence properly calibrated to what has actually been established versus what remains a reasonable but genuinely unproven guess for now.
The temptation to drop these qualifying markers in a later editing pass, for the sake of a cleaner sentence, should be resisted firmly, since the marker is carrying real, meaningful information the reader genuinely needs to weigh the claim properly. A piece that reads more smoothly without its qualifiers is not actually a better piece, it is simply a less honest one, dressed up in the confident language of settled fact.