You are probably correct. Just Google "Set guns" + "unlawful use of weapons" and you should find the link to the laws prohibiting same, if you need it. Only a complete moron (or someone looking to spend a long time in prison) would consider doing something like that in defense of property.
I'm still waiting to hear about the Chicago copper who shot two magazines full of 9mm into an offender's chest and was STILL strangled to death by the offender. Ripley's Believe It or Not! had nothing on it, nor did Snopes or Fantasy World. Just sayin'