Well, maybe to anyone who confronts him with a gun. Since that's not something that happens with great regularity it's pretty unlikely anyone is going to be at great risk. If you try to parley 'he was running when an armed officer told him to stop' into 'he could go on a killing spree any second' the SCOTUS ruling will blow you oput of court.
The strongarm robbery was shoplifting with a push out of the way when the exit was blocked, so this amplification to 'oh he could go on a wild killing spree any second' baloney is just baloney.
I didn't say nor does Missouri law or the SCOTUS case dictate that the Officer has to believe he will go a killing spree, nor could the officer have known at the time what the "strong arm robbery" consisted of All the law says and I've highlighted it a couple times now that the Officer has to reasonably believe that the individual has the intent to continue to do harm either to the Officer or the public. Given that at the time, he had the report of a "violent robbery" coupled with the assault on an officer (the officer himself) that occurred moments before the shots were fired. It is reasonable and within the confines of SCOTUS and Missouri law that either way this could have happened is acceptable in the eye's of the law.