I'm thankful I live where issues with animals are dealt with swiftly and forcefully. It's been so long since I've had an issue with a dog I can't recall what decade it was.
Our dogs are full fledged family members, I can't imagine exposing them to the risks of letting them run uncontrolled. On the other hand, I'm no idealist, I'd have no problem putting down a dangerous dog, but sometimes I wish it could be the owners that would be put down, and the dogs given a good home.