You can let them go,but it's like spiderman where he let the guy go, just to go outside to see the guy shot his dad.If you can't guarrantee that he won't run into your family somewhere when your not around to protect them .if you saw the robbery he must be in your neigborhood.There was a multible murder her in cleveland a week or so ago where the robber shot and killed the clerk and then went outside to shot a mother of an infant that left during the robbery before she could find safety.