I really can’t tell what “raised” means
"Raising a rifle" has a single fairly unambiguous meaning to most people I know; although we have only the story's word for that being what happened, it's not like a confusing type of description of events, along with the other elements (him retrieving the rifle instead of having it carried with him, running towards the crowd ignoring people trying to talk with him, and so on.) I actually think they did a pretty good job of explaining the circumstances which sort of clearly point to one conclusion, without doing anything other than presenting the factual circumstances.
There isn’t enough information in this story to infer intent.
If we assume that what's in the story is accurate, then yes, to me there is.
And I definitely can’t deduce the political leaning of someone barely mentioned
Correct. So why did you speculate that he may have been a leftist? I never said anything about his political leaning or the underlying motives.