Genetically speaking, the difference between a human and a chimp is incredibly small, but at the same time incredibly significant. One would imagine that the genetic difference between a human and a superhuman would be comparable.
If a scientist could show that, by scientific definition, a superhuman exists beyond the classic defintion of Homo Sapiens Sapiens, how do you think this would effect the application law and other such things as the Universal Declaration of Human Rights? Do you think that a defence attorney could have a case thrown out of court based on legal grey area and the fact of science that the, say, mutant victim is not, technically, human and therefore has no more right to legal recourse than a "space alien", and signficantly less than an ape or dolphin which are at least explicitly acknowledged and dealt with in human law?
Wouldn't responsible government be obliged to address and quantify an emerging superhuman population, so as to prevent that exploitation, and ensure the fundamental rights, of human and superhuman a like?