You'd think that humanity would have learned the horror of religious-targeted terrorism. That's not true; from many of posts, we see that there are plenty of people who are OK with religious persecution just so long as *they're* the ones doing the persecuting. They never learnt that "Never Again" doesn't apply only to Jews.
Actually, the phrase "never again" in its most common usage specifically refers to the shoah, otherwise known as the holocaust of the Jews. You can find many ways to say you are against genocide, but most people use this specific phrase when referring to the Nazi extermination of Jews. You can use it anyway you want to of course, but this is what people generally associate it with, the attempt by Hitler at Jewish extinction. Which, ironically, a good many of our islamic friends support, and regret only that Hitler wasn't able to finish the job.