You’re right, it’s not someone calmy walking toward you, and you have the right to use reasonable force in self defense in this scenario. Deadly force is not reasonable absent a threat of deadly force or serious bodily injury.
The YouTuber had no weapon. Did not in fact intend to harm the victim. Did not touch the victim. Did not say he was going to harm the victim. Did not make any aggressive gestures that he was going to harm him.
What fact are you hanging your hat on to say “ladies and gentlemen of the jury, this dude was clearly out to kill me, I had no choice.”
He walked towards me babbling while his three friends filmed? I would tear you apart in front of the jury if that’s your defense. You would be in tears realizing how fucked you are.
You don’t get to kill someone for walking toward you. You could punch him in the face. Not shoot him in the chest, though.