As I said Pat, it's individual comfort zones. If I had your setup with privacy fence (which makes snakes unlikely :), and were off the road, I'd probably feel much safer. But your situation is not what most have. If something happens to our dogs, we have to live with it, decide if we made the right choices, etc. As it should be.
But I also think we should have the right here to say if we will NOT do something and why, whether it is leaving collars on, leaving outside, crating, etc. There is a difference between saying why we make our choices and calling someone a bad owner for deciding different. When you see me call someone a bad owner for making choices, even if it is a choice I PERSONALLY feel carries more risks than I PERSONALLY am willing to do, call me on it.
We can be comfortable with our decisions when we think them out. I wasn't bashing those of you who leave dogs outside unattended, but I do feel it's legit to point out that for most people it carries risks. We have had a couple of local dogs poisoned this week, another person has signs up for dog stolen out of their yard. I am sure you didn't mean to be dismissive or indicate there are no dangers, but felt the need to expand here. Again, you have a fairly unique fencing and situation that helps reduce risks.