Muslims. That single would should be enough giving the philosophical nature of this forum. How ever lets look at the facts, their religion and culture is taking over every country they are allowed into, the are currently out breeding native populations in most parts of Europe, and whether you acknowledge it or not the rest of the world populous is currently in a state of war with said culture. For the most part a bloodless war where they are simply going to out breed the rest of the world populous and take each and every country over from the inside. Their religion is evil, their methods medieval and yet effective... This is a war of attrition and so far they are winning... Thus in this specific case I say yes.
If you answer yes, are you telling me you believe it is morally permissible to exterminate an entire group of people for whatever reason? Was it justified that the English settlers wiped out a majority of the Native Americans? You believe the Holocaust was justified? Eradicating six million innocent people? And the Cambodians butchered by the Khmer Rouge? What have all these people done to deserve such inhumanity? Genocide is irrational and atrocious. It is committed out of fear, paranoia and xenophobia.
The hell how could you even say yes to this question? Genocide is the wiping out of an entire nation or group, how could that ever be justified? It's murder but on a much, much worse scale. In history, when it does happen, It's almost always horrific. It's one of the most horrible things you can do.