Oh, hey, look--I'm not at all trying to justify the genocide. First, I specifically called it a genocide. And second, I specifically said I would use the word "justify." So don't put me in that camp, brother.
But I think it's materially different from the Nazi genocide of the Jews. The Holocaust was the set and overt policy of the de jure government of the Third Reich. From the head of state and head of government right down through his ministers, there was a set governmental policy of destroying European Jewry.
The Armenian genocide was much less set as government policy, if for no other reason than the government of the Ottoman Empire was incapable of setting policy. And I think that is reflected by your initial paragraph, includes one characterization of the Ottoman entry into World War I as certain advisors allowing the Germans to walk them into a war of choice. It's a lot messier than that.
Shortly after the outbreak of war, the Allies pursued the German battlecruiser Goeben and light cruiser Breslau across the Mediterranean. The pursuit is brilliantly retold by Barbara Tuchman at the beginning of The Guns of August. The Breslau and Goeben made it into the then-neutral port of Constantinople, where they . . . kind of fake sold themselves to the Ottoman Empire. Which is to say the Breslau and Goeben were reflagged and renamed. But they stayed under the same command and were crewed by the same crews (albeit with new uniforms).
So a couple weeks later, the Breslau and Goeben went into the Black Sea with orders from the War Minister, Enver Pasha, to attack the Russian fleet, which it did. But that order went out without the knowledge of the Navy Minister or the Grand Vizier (i.e., prime minister). So where Enver got the authority for that is unclear. By which I mean he didn't have the authority. It was absolute piracy.
So that's how the Ottomans got into World War I in very short form. It's actually quite a lot messier and more complicated than I'm really describing. Exactly who did what and why continues to be a matter of significant historical dispute.
And it's not like their governmental decisionmaking got less dysfunctional l over the course of the War. Throughout the War, the Ottomans continued to have ministers, generals, and provincial governors taking unilateral and unsanctioned actions that in any functional government would have been decided upon by the head of the central government.
And all this is not to in any way absolve the Ottoman Empire of the genocide of the Armenians. I'm not saying that it was the work of some rogue forces within the government. That's not right. It was the government that carried out the genocide, but it was a government that was by that point so dysfunctional and chaotic that it hardly merits being described as a "government." But, at the end of the day, that's the government the Ottoman Empire had.