If it's someone single, with no family etc... and they want to speed say at 3am on a dead motorway and I'm talking no one for literally miles and all there is to hurt, is themselves and they fancy a quick blast in a straight line providing they have a well maintained car/decent tyres and suspension and know how to drive it with genuine experience and the weather isn't risky/surface is decent, then that's upto them in my opinion - however going above 100 is a bit silly but a quick blast to 100 is less of a risk than say topping the car out.
The same as with someone drifting a massive empty industrial estate roundabout say, then that's upto them and they're risking themselves and the barriers they'll potentially hit.
Not condoning it but I think that's probably the only vaguely 'safe' scenerio off the top of my head purely because it doesn't endanger anyone else as it's away from everything else, but literally any place where there is housing/public places etc, then that'd just be selfish.
People who think that they can never crash are ridiculous, as is people doing anything in any hour when the public are about/near anyway an innocent can be hit.