On the first one, you kind of have to make a judgment call about whether the information you have suggests that that's a reasonable possibility, in which case maybe the social worker is accompanied by an armed officer. But additionally, someone trained specifically to resolve conflict in those scenarios may be better positioned to defuse the situation in a manner that leads to no one getting shot.
On the second, who cares if the person who hit them was in a stolen car? That doesn't require an armed officer on scene. They're just taking statements and information at that point.
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"The great promise of the Internet was that more information would automatically yield better decisions. The great disappointment is that more information actually yields more possibilities to confirm what you already believed anyway." - Brian Eno
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