Never overestimate the intelligence of investors.

There were already several cases of accidents while selfdriving and Tesla defense is "it isn't a selfdriving", and during this they announce a "robotaxi"?

Nah, the value didn't drop becaue it has even less value. The bubble let some air out in a stinking fart, because people start to realize that's what coming out of Musks mouth: "Warm air and nothing of substance."