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"Today, your house keys are basically useless for security" They are not useless.
Only some people have the skills and tools to open them - so they are useful at keeping most people out, even though they don't provide perfect protection. Most thieves are not professionals, but for example junkies who look for something easy. A simple automatic light, is already doing wonders to keep them away. |
But also, bricks through windows are equally not difficult and not expensive, though they do leave a bit more evidence. When my neighbors have been burgled, this is the preferred method of entry I've seen.