In fairness, Trump's tweets are not about actually doing anything, they are more about getting votes. So arguing the feasibility of suggestions outlined in a Trump tweet kind of misses the point.
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The questions are this: Who is right? Who decides that?
But if the situation escalated to the point that federal troops were needed (at the request of the state), then yes, there is almost certainly going to be shooting. You don't expect that a stern look from the Army is going to do the job.