I do have to say, there is some semblance of responsibility here. Afterall, at least he wasn't trying it on a public street.
I used to work at a BMW dealership, and those M5s are no joke at all. Even though they have 500hp with all the nannies turned off, people still underestimate them. They think yeah, its got the power, but its a heavy sedan. Not really all that much. We would take out the ones we had on lot all the time, well, not as much as the M3s, but we took them out quite a bit. I was only brave enough to kill all the stability things once, click the M button, run the full power. That thing will dead you real fast. You punch the gas, and it doesn't give you a chance to think if you really wanna do that. It just sits, s****, and gits.
We had one customer bring his in for some go fast work. Replaced the filters, ran new headers and exhaust, no cats, and did some ecu tuning to it. Bit of suspension bits, and new wheels. The owner took us out in it afterwards. It pulled clean and hard all damn near all the way to the century mark. He sent us a video not to long afterwards of him taking on, and taking out, a Gallardo from a roll.