>encourages dangerous behavior by untrained testers on public roads
There are idiots everywhere. The functionality has been locked behind their driver safety score to ensure only responsible drivers can beta test. There's a delusion that it is dangerous based on the amount of press coverage any Tesla involved incident gets.
Do I trust that their car is better at driving than me? No. But is is better than most people on the road. I'd rather be driving near a Tesla than a Prius.