There must have been excitement among the disciples of Jesus when news arrived about what Pilate had done in the Temple courtyard. They told him of the Galileans, whose blood Pilate had mingled with their sacrifices. This is all we know about the incident.
The Temple had an outer court for the Gentiles, but they were prohibited from entering the court of the Jewish women, or of course the deeper court of the Jewish men, or certainly the priestly court where the altar of burnt offering and laver were located just outside the Holy Place. Occasionally a non-priest entered the court of the priests to fulfill the legal requirements of certain sacrifices. Apparently these Galileans were doing precisely that, placing their hands on the sacrificial animal confessing their sins before slaughtering the animal offered in sacrifice for their sins. For whatever reason, the soldiers passed the barriers intended to keep the Gentiles and all the unclean or unqualified out. They marched directly into the courtyard of sacrifices with swords drawn and struck down the worshippers.
That is pretty frightening. You might suppose that they were in a pretty safe place doing only what pleased God. Why weren't they protected by that same God? The prevailing thought among the Jews was not to address the sinfulness of the soldiers but rather the guilt of the worshippers. They must have been great sinners for God to have permitted their slaughter, right?
Jesus said, no! "Suppose ye that these Galileans were sinners above all the Galileans, because they suffered such things? I tell you, Nay: but, except ye repent, ye shall all likewise perish." (Luke 13:1-5) Even some modern commentators assume that these must have been agitators and they had this coming.
I suppose, we feel that if we are faithful Christians, God will keep the evil men from hurting us and incidents such as these upset our sense of security. Then again, if evil men don't hurt me, that must be proof that God is protecting me because He accepts me as righteous, or at least righteous enough. So if I am safe and secure, what do I have to repent of? If I am happy and content, why do I need to listen to someone who corrects my sins? Jesus answers, "Not at all!" ... "and unless you repent, you can be sure of a much worse fate than those Galileans!" Bad things happen to good people. tp