The part of the video we don't see seems like it PRETTY FUCKING PERTINENT to the "stabbing". If the MFer has already vehicularly assaulted an innocent, and was continuing to "attack" (use his car as a weapon), this could certainly be a viable defense, but of course we don't see that do we. All we have is him stabbing a guy through the window, and everyone jumps to the conclusion he's a psycho.
Just like we didn't see the 30 minutes of video of George Floyd attacking the police and resisting arrest... The internet lies. It edits and distorts.
All that said, if you stab someone you are much more likely to go to jail than if you shoot somebody.