I am not sure about that spitting incident, I don't see it as a good way to defend the honor and integrity of the Torah. There is no doubt Stern is a kapo and a snitch. Look how he insisted on filing a criminal complaint against the kid, so that he would get stained for life with a criminal record.
"Then," Stern added, "the youth's parents came, who took it very badly, asked for forgiveness and apologized in his name. They also asked me not to file a police complaint. I told them that for their own good and in view of the fact that they failed [to discipline their son] – and as I said, they really are good people – it is best for all of us if I do complain. It is also my duty as a citizen."
Sure kapo Stern, it's "for their own good".