Killing someone requires a murderous state of mind. These were teenage yeshiva students on holiday. They wouldn’t know how to want to kill someone, let alone pull it off. The entire claim is preposterous. The company later fired the workers. Why they aren’t in jail is a question begging to be asked. See related links.
A few extremist sects of Jews unfortunately are known for aping the “rocky” habits of their Ishmael-bred brethren. The Modern Orthodox as a rule don’t go for this, but a few Hasidim, whose interpretation of the religion is more “charismatic” in flavor, and who tend to fanatically celebrate individual rabbis, do.
That’s why I was curious to see the dust settle over this and some investigation happen.