A single biological cell will be see as incontrovertable proof of life on mars, yet a fully intact unborn baby is seen as simply a clump of nothing that can be disposed of at will on earth.
Good point, but I think the term "preborn" is better than "unborn".
You make a good point, but to be clear it’s only the second part of your point that is flawed. Finding a biological cell on Mars would most certainly be definitive proof that life existed there. I am pretty sure that is extremely unlikely to occur. Evidence for life in these samples more likely would consist of finding biochemicals such as amino acids, nucleus acids and the like rather than intact cells. Currentl conditions on Mars are pretty inhospitable for life.