Wacken got really bad a few years ago. Like, it's normal to rain here, and it's normal for cars to not get off campground, so a dozen of farmers or two are around with their tractors to evacuate people back to asphalt. Except that year, the rain escalated to badly that cars sunk deep enough into the mud that their undercarriage sat on the ground and the mud started to seep into the belly and the engine area.
At that point, dragging the car out has a decent risk of ripping rather important resources out of the rig, and then you got a scrapping job left. That was a fucking mess. They also closed off the Autobahn near Wacken that year, because the massive amount of mud the cars dragged onto the Autobahn turned into a rather slippery affair -- and hitting slippery mud at 100km/h, 60mph without expecting it can easily turn into a life-changing ad-hoc roller coaster.
Doing all of that at your distances in the middle of fucking nowhere would not be enjoyable or fun. Folks drowning in mud in northern Germany is now mostly a funny story among metal heads and rescue folks.
Isn't the whole point of Burning Man to be self sufficient? Why not bring food and water? It is not that difficult to pack a few weeks of rations in your RV.
Firstly, there's a ton (TONs) of water left at the end of the burn, unless things have changed a lot in the past 20 years, nobody is running out of water. I'm guessing a few people have snacks left over.
Some people are getting pissy and hiking out, and the rest are going to party on until the road is rebuilt, helping one another the whole time, and some will be dancing their butts off.
I remember being with a group that had a van breakdown on the way into the playa, and the only sensible thing to do was tow it into the playa to get help from mechanic friends who would help fix the van on the playa.