There are communities that have different definitions of torture and where torture is permitted, and not thought immoral.
So is torture thought immoral in the US?
Thus, to say torture is objectively immoral is categorically false from a purely secular perspective.
Pure puffery. Morality has already been defined as community norms.
You contend it is immoral, another person disagrees on you with what torture is, and some would contend the torture you think is immoral isn't immoral. Thus you one preference of many.
I contend torture is not a community norm in the US, therefore immoral in the US. Do you contend torture is a community norm in the US, therefore moral in the US?
I contend that absent an objective deity, there exists no objective morality. And you prove my point, by admitting to my prior point, that definitions of torture vary from society to society, and what may be considered immoral among some in the US might not be elsewhere.
Furthermore, I probably have a different definition of torture than you.
Your issue is glazing over the term 'objective morality.' The fact is that you are correct in the core of your statement: objective morality DOES NOT EXIST. The problem is that you are taking that much further than that single statement. The following DOES NOT follow from that statement:
That isn't an argument. And you conceding that norms vary from community to community proves my point. Absent a universal and eternal arbiter of justice, there is no right or wrong, no good or evil, and all is permitted.
There is good and bad, right and wrong and it is defined by society. Those that have a rather shitty form of morality die off and those that don't tend to not only live on but also affect the morality and ethics of societies that follow. That is why our morality has, overall, improved over the centuries.
Objective morality would essentially call 99.9 percent of everyone that has ever lived evil bastards. The ONLY people that could be defined as somewhat moralistic would be those that lived in the last century or so. Are you really that arrogant to believe all people before us were truly evil? After all, even in this nation, slavery was permissible. Torture has been a societal norm - not immoral at all - for almost the entirety of human history. It was sanctioned by the very source of your 'objective morality' several times through burning people at the stake and on massive scales like the French Inquisition. The atrocities that man has inflicted upon one another throughout history have been legion. I do not think that is because the majority of people were evil or immoral - it was because society had not evolved to the point it has today.
And here is the kicker - unless you think that the people today are somehow special and different than ALL the societies that have already fallen - WE will be viewed as a rather immoral and backward society in the future. We will be viewed as doing truly evil to one another.
Your problem is you view society as a monolith, and ironically, your western morality is informed by judeo-christian ethics. So ironically, you ignore the basis for much of your own morality, and then appropriate it to other societies, assuming they just agree with your coddled liberal view and that it is for certain right just because of "reason and logic" or something. The problem is, your world view is obsolete in the face of an objective world view, you just view morality as a preference for your society. You talk about dying views. It is secular societies that are dying off. It is religious societies that are growing.
It is ironic you bring up slavery as though it's existence somehow discredits the foundation of Christian moral teachings or something. The Abolition Movement was inspired by Christians, particularly British Quakers, such as William Wilberforce.
Ironically, we as Whites and Christians are condemned for chattel slavery, as though it is exclusive to us and a blight on our civilization. When in fact, it was White Christians that gave birth to the abolition and fought for abolition throughout the world(ie. the British Empire's fight against the slave trade on the west and east coast of Africa).