[QUOTE=Boscibo]
I can’t understand leaving a child there, but I don’t have kids.
[/QUOTE]
Hell, I’ve had 3, and believe me, there are days on which you really wish that all it would take is leaving the kid in the car while you run in for an errand! 
Sorry I got so hung up on the “gas station” scenario. Its just that I was trying to think of a bunch of mindless chores I might do with my young kids in the car. Let’s say I needed to return some books to the library and pick up dry cleaning. No, they don’t ned to be done this moment, and my world won’t end, but the books are due and I’d really like to wear that shirt tomorrow. And I’ve been stuck inside the house with a kid all day and just want to experience the outside world however briefly. And I knwo I’m not the only parent who has found that when a kid is fussy but won’t nap, a car ride might be just the trick.
So I drive to the library, leave the car running in the library parking lot, and walk about 20 feet to the book deposit (no curbside drop-off available) while my baby sleeps strapped in her car seat. Anyone have a problem with that?
Well, if I manage to avoid being carjacked during that errand, I make my way to the dry cleaner’s, where I park immediately in front of the floor to ceiling plate glass windows, lock the car, and step inside the store for the minute or 2 that it takes to pick up my laundry. Are people seriously suggesting that instead of making this a 2 minute transaction (perhaps as little as 30 seconds), I ought to take a minute or 2 to unfasten the kid, either wake them up or carry them with me while I get my clothes, and then spend another minute or 2 strapping them back in - hoping that they did not wake up fussy during the process?
I assume you see where I’m going here. My next stop is the Salvation Army kettle in front of the WalMart - after which I might go to the boat to play the slots for a while. 
In my opinion there is somewhat of a continuum. Now I’m not sure exactly where I think leaving a kid of what age in a car for how long becomes endangerment, but personally, I’m comfortable saying a few minutes in front of a WalMart is not, while hours in the hot sun while gambling is. And I think unless there is a pretty overwhelming showing of danger to the kid, this is an area preferably left to parental discretion than government legislation.