If one is taking the tares to mean all the lost in general, it is absurd to then insist tares can't be saved. Per that scenario, of course they can be saved. Yet it makes nonsense out of the parable by viewing it in that manner. It is not until the blade was sprung up, and brought forth fruit, then appeared the tares also, that anyone even realized there was this tares issue to begin with. As if, assuming the tares represent all of the lost, no one even noticed that there were the lost in the earth in the meantime.
I don't know what it is about some interpreters at times? They literally just don't seem to care to carefully examine details that make their interpretation unlikely rather than likely. Details such as Matthew 13:26 and how that makes total nonsense out of an interpretation that is insisting the tares mean all the lost in general. Which includes atheists, unbelieving Jews, witches, satanists, etc, except no one even realized there were any of these throughout the earth until the blade the was sprung up, and brought forth fruit, then appeared the tares also.
Instead of trying to interpret this in light of Matthew 7, for instance, let's just ignore something Jesus said elsewhere that could shed more light on what He was meaning in Matthew 13:26 and let's just keep ignoring verse 26 and continue insisting that atheists, satantists, witches, etc, all resemble wheat in the early stages. Therefore, all of the wheat initially thought all of the lost were also them, the wheat. Some of these interpretations are downright laughable and can't be taken seriously. Such as, initially all of the wheat thought all of the lost was wheat. That's what some interpretations imply whether they want to admit it or not about their interpretation.