it isn't OK because it is a human (whether created in vitro, or born al natural) - humans are granted human rights (by other humans, out of self-interest i might add) which ostensibly prevent such things from happening to them. That is why slavery is against human rights.

We aren’t talking about current laws though, but philosophy/moral ones. Of course animal experiments are legal (if they pass an ethical examination)

Civic law is decided upon based on what society deems is moral.

Animal experiments are legal because enough people voted to legalize it (or not enough people voted to make it illegal)