In Rittenhouse's case, a DA made a political decision (IMO, of course) to prosecute an unwinnable case, and the jury acquitted Rittenhouse based on the evidence that showed he acted proportionally in self-defense.
In Dolloff's case, a DA made a political decision (IMO, of course) to not to prosecute. No jury will get to decide, based on evidence, whether shooting a firearm was a proportional response to "activating" (what does that mean? pulling the can out of his jacket pocket? removing a safety pin or device?) bear spray.
The cases are not at all analogous.