A half grown infant maybe, but that would make it a fetus, which is already alive. A half formed adult clone, is only half made. What they imprint on the cells while they're developing is beside the point, and that would likely have to be a final stage of brain building
but clearly, if it's still half formed & looks like an incomplete human body, then whatever that acceleration process is, it's done before it comes on line as viable
It doesn't matter, if the other systems aren't functioning, & it itself is still being formed, it can't be a functioning brain. At least it's fair to assume Riker & Pulaski don't think so
Because things that are personal & cause them anger have been historically known to make them violent enough to murder? I've never seen that on the show. My suspension of disbelief allows me to interpret their action as being consistent with how they behave otherwise. Even under duress, angered & personally effected, these people don't mindlessly execute living beings. Will Riker has since found a living clone out there folks, named Tom Riker, one that bothered him quite a bit, & he ain't murdered it yet.
This whole thing is a tempest in a teapot, that in order to claim malfeasance, one has to create their own narrative of what's being shown, instead of just considering the obvious reality. A half-formed human clone is not a human clone. It's a collection of clone parts that they destroyed, against the Mariposan government's wishes. We don't even know that when Granger yelled "Murders", he was referring to the clones. He may have been referring to his people "We have a right to survive" This 2nd remark suggests that by destroying the clones, from his perspective, they're actively extinguishing all the Mariposans, & that's maybe why he refers to them as murderers