Arctish
Centimillionaire
Someone claiming self-defenses needs to prove it. Proving a negative is not possible.A hit in the back isn't enough to disprove a self defense claim. (People can turn to flee faster than people can make the shoot/no-shoot decision. Hence you get bad guys who had an oh-shit-he's-armed realization, try to flee and get shot before the shooter realizes it's over.) Thus I do not find this credible.
I believe, actually, that the onus is on the prosecution to prove beyond a reasonable doubt that the use of force was unjustified. Proving a negative, in the logical, philosophical sense, is problematic. But these sorts of things exist in courts of law all the time.
In the Anglo-American tradition, the onus is on the prosecution.
The onus is on the defense when it argues self defense. This quote is from a newsletter published by a law firm, but it matches what the Wisconsin statutes say:
Wisconsin Court Clarifies New Self-Defense Rule
Self-defense is an affirmative defense that a person accused of a violent crime can bring, arguing that their use of force was justified because they were defending themselves. Wisconsin law allows deadly force in self-defense in the limited circumstances where the person defending themselves “reasonably believes that such force is necessary to prevent imminent death or great bodily harm” to their person. Importantly, some states impose a duty to retreat from a conflict, but Wisconsin is not among them. However, Wisconsin does allow juries to consider whether a defendant could have retreated in determining whether the use of deadly force was “necessary.”<link>.
A person claiming self defense has to support their claim. Rittenhouse's lawyers might be able to do that. The video and Rittenhouse's age lend credibility to a claim he feared he would suffer great bodily harm or might even be killed if he didn't shoot. But it might not be easy. A lot depends on what happened that caused Rosenbaum to start chasing Rittenhouse.
Also, it looks like Huber and Grosskreutz were attempting to disarm Rittenhouse, and that Rittenhouse knew people were trying to take his weapon after he shot Rosenbaum. That could undermine his claims of self defense for shooting those two, but again, his age might be a deciding factor.