In a way, paying $ for an alarm accessory (whether as an option or in the price of the vehicle) is primarily for the benefit of the insurance company. The alarm may deter some vehicle thefts or cut short attempts to strip a car, but in the end the insurance should reimburse the owner for the loss (less deductible). Even with a modest discount from some insurance companies for cars equipped with an alarm, you are still paying what amounts to another insurance deductible, upfront, whether the alarm's presence in the car ever makes a difference in the real world or not.
As far as the car itself and sentimentalities, I remember a local auto dealer who for years advertised his low selling prices on radio by saying, "I ain't married to none of them."
As
@Tommm wrote above, "The same week the Porsche was stolen my beat [sic] friend was diagnosed with stage 4. Made the new motor and other work recently done to the car seem trivial. If they want the Mini, have at it. That's what insurance is for."