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Firstly there is the ethical problem of disproportionality. While some criminals do commit horrific crimes, homeowner vigilantism is clearly not the answer.
Even if one disregards the ethical problem, there is then the functional problem of perverse incentives. Applying the death penalty to rapists for instance may lead to perpetrators killing their victims to prevent witnesses. Another example would be armies who execute POWs will deter enemy soldiers from surrendering in the first place. Likewise, killing thieves might lead to escalation and petty criminals committing murder as seen in the link below.
Armed Intruder Who Shot Homeowner Argues ‘Stand Your Ground’ Defense – ThinkProgress
I can see your point but I'm not sure this would technicality be a case of vigilantism. Alamaba has a Stand Your Ground Law that allows people to defend themselves or a third party from a perceived threat of imminent danger. Part of being a vigilante is going outside the law, this homeowner didn't go outside the law.