I'm sure those girls find it very reassuring that you think they are worth as much as they would be if they were boys on some transcendent level even though them being girls means they aren't allowed to live.
This argument isn't about whether all people being equal is right or wrong, it is about whether or not people are actually equal in reality.
The accurate version of your analogy would be "it's like making a counter argument against someone claiming, 'genocide does not exist' with 'but genocide happens in x country, so therefore your statement is false'" which is a very valid counter argument.
Yes, the analogy was a little off the mark but it does pertain to the how we define the inherent equality of every person. How we define the term affects what is being argued. There are undoubtedly instances in which equality appears to be absent in a particular culture, country, religion or any social grouping in general. That, I would define, as equality in practice; what we do with the concept in terms of laws or customs, for example. And that is how you define it; a quantifiable concept that can be proven or discredited through calculating how many people possess egalitarian rights and freedoms.
What I am saying is that the argument that every human being is born equal is a
principle. It is an intrinsic attribute that is only diminished through unjust laws and misguided interpretations of it. No one is born with more value than anyone else; some people are born into more fortunate circumstances but fundamentally their life's worth is measured by what they do, their accomplishments and their contributions. It's a roll of the die and some people are lucky enough to be born into a social setting that recognizes and respects their autonomy. Many others, such as those Chinese daughters mentioned earlier, are not born into an egalitarian society. In principle however, the value of the individual in either setting is no different.
Let me reiterate, I understand that in reality, the real world or however else you care to phrase it, inequalities are observable and seem to contradict the argument. These instances are examples of an individual's rights being infringed upon, sometimes on a wide systematic scale. But when a society accepts the idea that every person is born equal it becomes clear that such actions are detrimental to a human being's innate worth. I believe the concept itself serves, or at least contributes, to our moral compass. Compassion, empathy, respect for one another; these are all things which nurture society and are therefore quite beneficial for the prosperity and longevity of a nation. That is why this principle has served as a fundamental component for most of the world's democracies.
So yea, maybe we're just arguing two different points but I figured I would just articulate my point a little more clearly.