The text given provides a pretty good description of how the United States acted during the Armenian genocide, which is that it was willing to provide humanitarian aid to those fleeing the atrocities, but was completely unwilling to do anything about the problem itself. The United States was, without a doubt, a bystander in this conflict, and it's pretty easy to argue that the United States, as well as some European powers, can be heavily faulted for allowing everything that occurred during those few years to take place.
We could have actively cut ties from Turkey, but instead, Turkey wound up cutting ties with us, after the United States had spent a good amount of time standing around with its metaphorical hands in its pockets. Whether or not genocide had been defined yet, and whether or not it was something which was a prominent idea in the eyes of the American public, any countries witnessing these events who have the power to help prevent them have a complete moral obligation to do so. Obviously not every country is always going to be able to make a difference in any given situation involving genocide, and it is possible that genocides can happen without a large portion of the world even really knowing about it. But in the case of the Armenian genocide, there was media outcry in Britain, the United States, and numerous survivors present to tell their stories. There was ample evidence that there was a genocide being committed in Turkey, and yet the United States still resolved not to do very much in response. Even worse, Germany remained steadfast in defending them all throughout the genocide, because they believed that the already existing alliances they were a part of took priority over actual loss of innocent human life. Given these things, all of these countries should have absolutely taken a stand against the prosecution of the Armenians. I think this same logic applies to any genocide being committed if the country in question has the power to send aid or bring major help in any way; the United States had the same obligations during the Holocaust, the Rwandan genocide, and the modern conflict in Ukraine, regardless of whether or not it actually followed through on them.
All I really ask is that the United States or any other country bearing witness to a blatant genocide like this acts as more than just a witness. As a massive global power with immense military strength which portrays itself as standing for freedom and human rights, it's completely unfathomable that anyone would think of it as anything other than massively hypocritical for the United States or any other comparatively powerful countries at that point in history to sit idly by and watch the mass slaughter of Armenian people just wash over Turkey. The creation of the word "genocide" shouldn't change anything about that.
Most world nations behaved completely differently during the Armenian genocide than they did during the genocide which occurred in Namibia. It's true that most of these nations weren't exactly eager to jump in and interfere with Turkey and its determination to essentially eliminate a race, but that doesn't mean there wasn't backlash. There were a number of journalists and articles in Europe and the United States pushing for the United States to do anything about what, such as Henry Morgenthau. Although the Germans were much more open about the atrocities they were committing in Southwest Africa, there seemed to have been relatively little backlash, heavily as a result of white supremacy. People in the United States could have seen Armenians as closer to them, especially given the large Christian population in this country, while the cultures of the Herero and Nama people were so far separated from those in the United States that most people here had probably never heard of them. These ideas last until today; although both the Armenian genocide and the Herero-Nama genocide were intensely horrifying atrocities, I had only heard of the Armenian genocide until this year, and up until recently, much less research was done into the genocide against Armenians in Turkey than the genocide against the Herero and Nama peoples in what is now Namibia.