Video cameras don’t stop people from shooting you. They only possibly aid in criminal prosecution later.
Alarms don’t prevent people from kicking your door in and response is not instantaneous.
Locked doors can still be broken. I have friend who was pistol whipped in his bedroom by intruders.
First thing I noticed; the posed photo of the perp trying to pry open a glass door that he could smash through in a fraction of the time with the crow bar. Yeah, these people know their stuff!