I reckon a secret kill switch on the fuel pump circuit. Similar on the starter has more limited deterrent features as the battery is relatively close to the starter for hot wiring.
Overly loud alarms are illegal, heavens to Betsey, we can't be injuring criminals.
I had a mate who owned a workshop. He was broken into, by cutting a hole in the tin wall, from the adjacent, vacant shed. The shed was repaired and tools replaced by the insurance company. Six weeks later the exact same thing happened. The police said it would have been the same crooks, they know it takes six weeks finalise the insurance claim.
My mate, John said that in six weeks, he and I would be waiting in the shed, with a bottle of rum and baseball bat each

. The cop said that if we did so, we'd both be charged!
John's brother landed a job, selling alarms. The top of the range model was so loud, it affected people's balance. John had two fitted, diagonally opposite each other.
A month later, they were recalled as illegal. Apparently the owner could be charged with multiple offences, including assault and deprivation of liberty, if the alarm hurt or disabled a trespasser.
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