I don't think my two girls will ever be let out alone free to do whatever... I feel harsh saying it, but I'd rather spend money on a run or something and know they're safe...
Nowhere is completely safe. Even if it isn't for roads and stuff, I feel rude saying it , but there's also some not very nice people..
But I understand once they go out it's not really fair to keep them in, that's why the big ones are allowed out...