1. Jeter and Amir were neither thugs nor terrorists. They were dumb kids, plain and simple. They meant no harm to anybody, human or alien. They were armed with blatantly obvious toy guns and throughout the whole ordeal they used PG language.
2. They weren’t turned into ash. Weren’t deleted from existence with the pull of a trigger. There was no disintegration ray involved. The alien guarding the main gate used vasoconstrictor-based pistols. That’s how Jeter and Amir died, from internal bleeding. The medical report that wasn’t shown on TV confirmed it.