Your pedantry knows no bounds.
My point was the clones were akin to a fetus in a womb in the earlier months of pregnancy. They needed to be in the chambers in order to continue to develop not only into individuals but in order to survive, physically, outside of the chamber without life-support elements that may have been in or provided by the chamber.
Yes, a baby cannot survive on its own outside the womb without the help of an adult (or older, competent, person.) But it's biologically capable of functioning on its own without the need for help by being biologically connected to the mother.
It can breathe, it can pump blood, it can take in and make use of nutrients. It's an independent being. (Barring any birth defects or health complications.) In the womb it needs the mother's body to do all of these things, a fetus is not much more than a very complicated parasite inside a host. It leeches nutrients and biologics from the mother.
Even pre-maturely born babies struggle to survive once outside the womb for the simple fact they've not developed long enough in the womb and need to be kept alive with machines in order to continue developing to a point they can live on their own body's processes.
The clones in the episode were in the incubation chambers and other than having vaguely human-like forms they were clearly underdeveloped and (ignoring the special effects limitations of the series at the time) clearly had some "growing" to do.
They were very likely akin to a fetus inside the womb before reaching a developmental stage where it can survive outside the mother and without the need for machines to help the developmental process. Now, while a prematurely born baby kept alive on life-support is certainly considered a person and has all of the rights as one, meaning it cannot be 'aborted' at this stage (Though life-saving treatment can legally be held should the child succumb to its deficiencies) we can infer that the clones are not, at least not in the stage we see them in the episode. If they were further enough along to display much more distinctive features or to have some biological functions operating (there's not even any indication in the episodes the clones were breathing) we could chastise Riker for vaporizing them.
But from what we've seen, and know, the clones were not yet far enough along to be seen as living individuals. Vaporizing them was no more a big deal than aborting a fetus in maybe the first trimester, before it can survive outside the womb. And, again, we know that abortion is considered a viable option for expecting mothers in the 24c.