Making Spotlight's siren going off on motion detect

Which is the main purpose of a security camera? To be a deterrent to thieves. And how to reach this goal? Telling them that we know that they're making something bad, so they cannot continue on doing it and they've to go away. Ok, when the Spotlight Camera detects a movement switch on its lights, but it's not enaught: we have a siren, why don't use it? If the thief try to open my garage (or enter my garden, etc...) during the night, while I'm sleeping, I cannot push the button and make the siren sound: it should be automatically done by the camera itself, it is the purpose of an alarm system! Otherwise I can to don't buy any camera and pass the night on my window looking for thieves and clash pot lids togheter, it would be the same effort! Really, please, make siren automatically sounds...otherwise they're quite unusefull. (and I have five of them, 1 for my garage and 4 for my parents' garden!) Furthermore, I've Ring Alarm, through "linked devices" I can make the spotlight camera sounds when Alarm sensors detect something, BUT I cannot make the Alarm siren rings when the Spotlight detects something...this is crazy.