“You are arbitrarily making up this distinction between intended discontinuation and passive discontinuation. Who said that is even a relevant criterion??”
If you can’t understand the difference between something that was leachatchila b’shita done and something that we was done unwillingly and for no other reason than that it was impossible to do otherwise, then as they say “you can bring the horse to the water but you can’t make it drink”.
You’re missing the point. Yes, it is obvious that such a distinction exists. But who said that being passively discontinued is grounds to say that there is no basis for what was discontinued to fall under the ambit of Mesora?? In which case your chakira is irrelevant because despite having been lost due to tragic circumstances, techeiles is not by dint of that outside the ambit of Mesora.