I think the reason for the harsh streetracing laws now is because the public has had it with street racing and has been demanding the legislators crack down on it.
Just a few weeks ago in Scottsdale, Arizona, a street race occurred between a 42 year-old driving a Mercedes-Benz, and a 25 year-old with his girlfriend in a Mustang.
Unfortunately, up ahead, was an old man making a left turn, so he crossed their path, most likely because he looked and saw two cars way in the distance, thinking they were going normal speeds, unaware they were going at twice the normal speed and thus approaching much more quickly.
He was in a 70s Camaro and was also a former state legislator
Well they wiped out, his car was destroyed, his body thrown over 100 feet, and to top it all off, he was on the phone with his wife when the crash occured.
The Mustang and Mercedes were also severely damaged but both guys and the girl walked away okay.
Arizona already has tough laws for this I believe, and now that a former state legislator died they're only going to crack down harder in all areas of street racing.
I would imagine California, having a prominent car culture and a government that loves to regulate everything, is only too happy to copy this.