If Poe had said something along the lines of ‘Retreat, nothing can stop it now!’, then it would have been clear that Finn was acting out of pure unthinking hatred for the First Order.
“The cannon is charged, it’s a suicide run! All craft, pull away!”
“Retreat, Finn! That’s an order.”
“Finn? It’s too late!”
TLJ doesn’t hand-hold. Personally I’m not a big fan of on-the-nose dialogue so I tend to think that’s a plus. Whether something fits a different interpretation if you look at it crooked shouldn’t matter if the intended interpretation is clear, which it absolutely is in every commonly disputed case across the movie.