People who think the Police should have guns routinely have zero real experience with firearms and have played too much CS. I can see zero benefits to these women having a firearm and a ton of reasons why them having one each would have made the situation a lot lot worse.
Though I'm not in favour of arming police in general I'd have said that in this specific incident, if they happened to be armed officers, it would have been useful. We don't know the exact details but its highly unlikely they both died instantly (its not CS) one or more of them might have survived if they were armed.

