And they are designed to keep the crazy criminal types here from harming the unarmed innocents around them.

Streaming live from a camera mounted on his helmet, a gunman pushed on the doors of a synagogue, fired several shots at a lock on the door, stuck an explosive in a door jam and lit it.

But he couldn’t get in.

The fact that the door held likely spared the lives of the dozens of people inside the synagogue on Yom Kippur, the holiest day in the Jewish calendar.

Police say the gunman killed two people Wednesday in the eastern German town of Halle — one directly outside the synagogue, and one at a nearby kebab shop. Police have arrested the suspected gunman.