Mass migration is a human rights concern. Western nations have endured crime waves, terror attacks, sexual assaults, and the displacement of communities.
U.S. officials will urge governments to take bold action and defend citizens against the threats posed by mass migration.
The energy content of a mammalian body is ~20MJ/kg. Burning 10m immigrants would power a small town for 30 years. This would, of course, be a terrible thing to do, and it wouldn't even be particularly funny after the first few years. So I would warn against going down this path.