I'm all for safety but there is something about common sense too.  This year a scout group came paddling into a lake we were staying on at about 8:00 PM.  The lake only had 3 sites and all the sites were full on the lake and they looked beat.  They decided to set up camp on the portage on the other end of the lake.

Now that may all be well and good if they were tired and needed to be safe and was the only spot big enough for their large group.  The part that really irked me was that they decided to sleep in the next morning and when we tried to leave the lake at 7:30 they were all sleeping in their tents while their canoes were left in the way to try and get out at the portage.  I will say I was not too quiet as I had to get on shore and move their canoes so we could continue on our way.

I do know of another group that had set up camp on a non designated site because of all the other sites being full on a lake and they did get a hefty fine (I believe $125 about 3 years ago) from the ranger the next morning before they could leave the spot.