I use this one as my 24/7 go-everywhere self defense blade:
http://www.coldsteel.com/Product/26ASTX/6_TI-LITE_ALUMINUM_HANDLE.aspxAnd as a utility I use this one for everything else:
http://www.smith-wesson.com/webapp/wcs/stores/servlet/Product4_750001_750051_807567_-1_757864_757853_757837_ProductDisplayErrorView_NThe Kaliforniya CCP is a lot like the UK in that there are no Open Carry rights for firearms here, and your access to CCW permits is almost nonexistent. Therefore like in the UK, knife crime is quite prevalent in California.
Ergo you need to be armed somehow wherever you go.
I was on a subway train here on one occasion where two guys held an entire train car hostage while they beat the crap out of another guy presumably for some infraction against them. They used knives.
I would have love to have had my trusty CZ 97B with me that day, illegal or not.
I would have blown them both away, then took off without waiting for a congratulatory salute from the local worthless sheriff.
In the case of a crowd shooting like that, since I already know someone is going to whine about this, when you shoot you always need to be aware of your target, the backstop behind the target, the area around the target, and the space between you and the target.
Therefore normally to take a shot in a crowd situation, you need to get down on one knee, and shoot UP at your target, so the bullet continues after it hits the target to fly off into the sky above and less likely into another passenger.
They teach you that in a self defense shooting class. Hopefully everyone will get a chance to take these kinds of classes.
Be prepared.
